Early Mid 20th Century

This includes developments of the early 1920s, late 1920s, early 1930s, and late 1930s.

Warren G. Harding, Calvin Coolidge, Herbert Hoover, and Franklin D. Roosevelt presided over the United States, which was afflicted by the Great Depression in the 1930s.

Italy became a Fascist dictatorship under Mussolini, invaded Ethiopia, and allied with Germany in World War II. In Spain, unrest following the rule of a dicatorial prime minister caused a national collapse, and King Alfonso VIII fled the country. A second Republic was proclaimed, but the Spanish Civil War broke out in 1936. The Russian empire was transformed into the USSR.

The Ottoman empire collapsed and the remnants reformed as the secular state of Turkey under the leadership of Mustafa Kemal. Egypt became independent of the Ottoman empire, but was heavily influnced by the British. The Qajar dynasty ruled Iran, but the discovery of petroleum led to more intense interest by the British, and the British and Russians divided the contry into spheres of influence. Algeria was ruled as a department of France. In 1932 the kingdom of Saudi Arabia was formed.

There was agitation for Indian Independence.There was resistance to British rule in what is now Pakistan. Harappa and Mohenjo-Daro were first exavated in the early 1920s. The British ruled what is now Bangladesh as part of British India.

In China, there was civil war between Nationalist and Communist factions, and Japan invaded. The Japanese invaded Manchuria, in China, in 1930. Korea was occupied by Japan.

The French ruled Vietnam. In Siam, the absolute monarchy was ended and the name of the country was changed from Siam to Thailand. A nationalist movement continued, and Burma was split from British India in 1937. Indonesia was ruled by the Netherlands as the Dutch East Indies. An independence movement arose in the Philippines.

Nigeria was ruled by the British empire, although nationalism was beginning to develop.

Tanganyika and Zanzibar were ruled by the British. The Colony and Protectorate of Kenya were part of the British Empire.

What is now Congo (Democratic Republic) was ruled by Belgium as the Belgian Congo.

Early 1920s

Late 1920s

Early 1930s

Late 1930s

Other history

Other history including prehistory, antiquity, classical and medieval history; other modern history including the 16th century, 17th century, 18th century, 19th century, and other 20th century; and the future can be used to examine the early 1920s, late 1920s, early 1930s, and late 1930s.


Sociology including peoples of the world, communities, and social mechanics can be used to examine the early 1920s, late 1920s, early 1930s, and late 1930s.


Institutions including religion, government, economics, education, and family studies can be used to examine the early 1920s, late 1920s, early 1930s, and late 1930s.


Religion including particular religions, religous organization, religious practice, and religious belief can be used to examine the early 1920s, late 1930s, early 1930s, and late 1930s.

Particular religions

Particular religions including Abrahamic religion, Asian religion, pagan religion, and secularism can be connected.

Abrahamic religion including Islam and Judaism can be connected. Christianity including early Christianity, Catholicism, Protestantism, Orthodoxy, and Mormonism can be connected.

Asian religion including Indian religion, East Asian religion, and Persian religion can be connected. Pagan religion including European pagan religion, Asian pagan religion, African pagan religion, American Indian religion, and neopagan religion can be connected. Secularism can be connected.

Religious organization can be connected. Religious practice can be connected. Religious belief can be connected.


Government including particular governments, government activity, government structure, and law can be used to examine the early 1920s, late 1920s, early 1930s, and late 1930s.

Particular governments including local government can be connected. International government including modern compacts, colonial empires, and traditional empires can be connected. National government can be connected.

Government activity including administration and succession can be connected. State relations including warfare, diplomacy, and intelligence can be connected.

Government structure including government forms, executive systems, legislative systems, judicial systems, and political parties and interest groups can be connected. Law including international law, Western law, Asian law, and tribal law can be connected.


Economics including economic systems, industries, and economic activities can be used to examine the early 1920s, late 1920s, early 1930s, and late 1930s.

Economic systems including economic system types, networks, and firms can be connected. Economic system behavior can be connected.

Industries including social and medical services, commercial and financial industries, communications industries, transportation industries, building related industries, manufacturing and extraction industries, and food and agricultural industries can be connected. Economic activities including consumption, distribution and exchange, and production can be connected.


Education including school systems, educational organization, cultural institutons, teaching, and research can be connected.

School systems including higher education, secondary education, and primary education can be connected. Educational organization including administration, faculty, students, and course material can be connected. Cultural institutions including performance venues, libraries, and museums can be connected. Teaching can be connected. Research can be connected.


Families including particular families, kinship, parenting, and marriage can be connected.

Particular families can be connected. Kinship can be connected. Parenting can be connected. Marriage can be connected.


Culture including behavioral culture, conceptual culture, and material culture can be used to examine the early 1920s, late 1920s, early 1930s, and late 1930s can be connected.

Behavioral culture

Behavioral culture including cultural events, recreation and entertainment, occupations, and customs can be connected.

Cultural events including holidays, disasters, expeditions, awards, and gatherings can be connected. Recreation and entertainment including sports, games, theater, dance, and music can be connected. Occupations including service occupations, industrial occupations, communication occupations, transportation occupations, building occupations, and food-related occupations can be connected. Customs including institutional customs, social interaction customs, clothing and dress customs, living and dwelling customs, and vital customs can be connected.

Conceptual culture

Conceptual culture including philosophy, applied science, mathematics, literature, graphic arts, and language can be connected.

Philosophy including philosophical schools and doctrines, special topics, aesthetics, ethics, metaphysics, epistemology, and logic can be connected. Applied science including applied social science, medical science, information science, accounting, navigation, engineering science, and measurement can be connected. Mathematics including mathematical rigorization, statistics, geometry, analysis, algebra, and arithmetic can be connected. Literature including particular works, literary types and genres, literary forms, and oral tradition can be connected. Graphic arts including animation, photography, printmaking, painting, and drawing can be connected. Language including languages of the world, writing, and linguistics can be connected.

Material culture

Material culture including miscellaneous artifacts, communications technology, transportation technology, clothing and dress, foodstuffs, building technology, and industrial technology can be connected.

Miscellaneous artifacts including sculpture, musical instruments, toys, and medicines can be connected. Communications technology including electronic communication, graphic communication, and written communication can be connected. Transportation technology including space technology, air transportation, water transportation, land transportation, and packaging can be connected. Clothing and dress including garments, adornment, and fabrics can be connected. Foodstuffs including prepared foods, preserved and processed foods, and raw foodstuffs can be connected. Building technology including outdoor structures, complete buildings, building components, furnishings, and materials can be connected. Industrial technology including advanced technology, utilities, weaponry, machinery, chemical technology, fuels, and tools can be connected.


Anthropology including particular groups, human geography, human ecology, physical anthropology, demography, and social foundations can be connected.

Particular groups

Royal Society

Human geography

Human geography including European geography, Asian geography, African geography, North American geography, South American geography, and Oceanic geography can be connected.

European geography including Balkan geography, Eastern European geography, Central European geography, Italian geography, Northwest European geography, Iberian geography, Scandinavian geography, and Island European geography. Asian geography including Southwest Asian geography, South Asian geography, Central Asian geography, North Asian geography, East Asian geography, and Southeast Asian geography can be connected. African geography including North African geography, West African geography, North Central African geography, South Central African geography, East African geography, and South African geography can be connected. North American geography including Northeastern American geography, Northwestern American geography, and Southwestern American geography can be connected. South American geography including Amazon geography, Andean geography, and Argentine geography can be connected. Oceanic geography including Australian geography, Pacific Island geography, and Antarctic geography can be connected.

Human ecology

Human ecology including human effects on the environmment, relations with other life, and environmental effects on people can be connected.

Human effects on the environment can be connected. Relations with other life can be connected. Environmental effects on people can be connected.

Physical anthropology

Human dispersion can be connected. Racial variation can be connected. Human origins can be connected. The first skeleton recognized as Australopithecus was found in South Africa in 1924.


Population change can be connected. Population size and structure can be connected. Migration can be connected. Mortality and morbidity can be connected. Birth and fertility can be connected.

Social foundations

Social group behavior can be connected. Social group types can be connected. Social control can be connected. Social interaction can be connected. Social presentation can be connected.

Personal studies

Personal studies including biography, psychology, and the human body can be connected.



Psychology including social psychlogy, personality, mental disorders, developmental pyschology, behavior patterns, mind, and behavioral elements can be connected.

Social psychology can be connected. Personality can be connected. Mental disorders can be connected. Developmental psychology can be connected. Behavior patterns can be connected. Mind can be connected. Behavioral elements can be connected.

Human body

The human body including human form and appearance, disease, the human life cycle, human body functions, and human body systems can be connected.

Human form and appearance can be connected. Disease can be connected. The human life cycle can be connected. Human body functions can be connected. Body systems can be conected.


Science including biology, earth science, astronomy, chemistry, and physics can be connected.


Biology including biohistory, ecology, systematics, organism biology, cell biology, and molecular biology can be connected.

Biohistory including Precambrian, Paleozoic, Mesozoic, and Cenozoic life can be connected. Ecology including biogeography, ecosystems, evolution, system ecology, community ecology, population ecology, and behavioral ecology can be connected. Systematics including animals, fungi, plants, protists, and microbes can be connected. Organism biology including behavior, life cycle, morphology and form, organ systems, tissues, and habitat can be connected. Cell biology including cell types, behavior, and structure can be connected. Molecular biology including nucleic acids, proteins, lipids, carbohydrates, other organics, and inorganics can be connected.

Earth science

Earth Science including geohistory, physical geography, atmospheric science, hydrospheric science, and geology can be connected.

Geohistory including Precambrian, Paleozoic, Mesozoic, and Cenozoic periods can be connected. Physical geography including mapping, terrestrial geography, and oceanic geography can be connected. Atmospheric science including climatology, meteorology, and atmospheric structure can be connected. Hydrospheric science including oceanography, glaciology, groundwater, and fresh water can be connected. Geology including interior geology, geologic processes, landforms, petrology, and mineralogy can be connected.


Astronomy including galactic astronomy, stellar astronomy, and local astronomy can be connected.

Galactic astronomy including cosmology, galactic types, and galactography can be connected. Stellar astronomy including astrocartography, star groupings, stars, exoplanets, and the interstellar medium can be connected. Local astronomy including the Sun, planetary systems, minor bodies, and the interplanetary medium can be connected.


Chemistry including chemical systems, chemical change, and chemical substances can be connected.

Chemical systems including organic, inorganic, gas, liquid, and solid chemistry can be connected. Chemical change including nuclear reactions, chemical reactions, and physical changes can be connected. Chemical substances including mixtures, compounds, and elements can be connected.


Physics including the structure of matter, quantum physics, relativity, electromagnetism, thermodynamics, and mechanics can be connected.

The structure of matter including exotic matter, common bulk matter, molecular physics, atomic physics, and subatomic physics can be connected. Quantum physics can be connected. Relativity including general relativity and special relativity can be connected. Electromagnetism including optics, magnetism, electric current, and electrostatics can be connected. Thermodynamics including statistical mechanics, nonclassical thermodynamics, and classical thermodynamics can be connected. Mechanics including gravitation and celestial mechanics, general mechanics, rigid body mechanics, and particle mechanics can be connected.

Created 5 Mar 2013 Last updated 4 Sep 2017