Britain figures out how to use coal to power machines. Suddenly, humanity isn't limited by muscle or wind anymore.
This is the era of the (the middle class). Cities explode in size, and railways stitch continents together. However, this "progress" has a dark side: Imperialism . European powers race to carve up Africa and Asia to feed their factories, setting the stage for a global explosion. 3. The Great Collapse (1914–1945) Historia Del Mundo Contemporaneo Santillana Pdf Free