How did European and United States imperial actions and policies during the 18th and 19th centuries shape the history of the 20th century?

The imperialistic intentions and agendas of both European countries and the United States were the biggest hurdles for many countries across the globe that were colonized and pushed into the economic drain despite being economically well off from the rest of the world.

Asia especially India is one such example that was oppressed for some two hundred-plus years by Britain.