Discover how historians collect and analyze evidence about history. Explore early humanity, the development of empires, and religions of the world. .Learn about the world from the fall of the classical empires up through 1750. Examine the world around 1750, as regions of the world became more connected through trade, travel, and ideas. Investigate the political and economic revolutions that transformed the world in the 1700s, 1800s, and early 1900s. Learn how imperialist and nationalist competition among nations lead to two devastating world wars in the first half of the 20th century.. Explore international developments, such as the Cold War, in the post-World War II world. Investigate nation-building and globalization in the contemporary world.