Industrialization: Industrialization refers to the process of transforming an economy from primarily agrarian-based production methods into industrial ones. It involves mechanization of labor-intensive tasks.
World Wars: Refers specifically to World War I (1914-1918) and World War II (1939-1945), two major global conflicts that had a significant impact on the twentieth century.
Decolonization: Decolonization refers to the process by which colonies gained independence from their colonial rulers. It was a defining feature of the mid-twentieth century as many nations sought self-determination.