How many years passed between columbus’ voyage (1492) and the american revolution?

Even though both ww1 and ww2 were in many ways the same conflict with basically the same countries facing off against each other, the way each war started was significantly different. the question is how what were the differences on how they started

Under the new imperialism europe did not need large numbers of people to control territories because of

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?