The 20th century is now being connected to details of physics. The 19th century is being connected to elements of science. The 18th century is now being connected to elements of culture and anthropology. This is now one of the limiting factors.
Within sociology, Western civilization is being connected to elements of culture. Asiatic peoples are comparatively overdeveloped and I am waiting for the 18th century and government to catch up. Social mechanics is being connected to personal studies and science.
Religion is being connected to chemistry and physics. Government is being connected to elements of culture and anthropology and is one of the limiting factors.
So far, the development has been highly skeletal and rather bare of commentary. Now that basic elements of science have been sufficiently connected to history, I now feel free to introduce slightly more commentary to elements of physics and have begun with mechanics, thermodynamics, and electromagnetism. As I progress, expect to have more content in physics.