The detailed investigation of the 20th century is about to begin with the early 21st century. This is slightly held back by the need to clear the way with developments of the 16th century, education and behavioral culture. The 19th century is now fully connected to science. The 18th century is connecting to details of personal studies. The 17th century is being connected to details of culture and anthropology. The 16th century is waiting on developments of education and behavioral culture.

All three major divisions of sociology are now fully connected to aids. Western civilization is being connected to details of science. Asiatic peoples are being connected to details of anthropology. African peoples are being connected to culture and anthropology.

Western cities are being connected to elements of anthropology and personal studies. Asian cities are being connected to institutions.

Social mechanics is now fully connected to aids through the sciences.

Government is now being connected to personal studies and science. Economics is being connected to culture and anthropology. Education is being connected to other institutions.

Behavioral culture is being connected to institutions.