Imperialism was a time where countries mainly those in Europe were going around the world and taking over other smaller countries. The main countries that partook in this event were France, Britain, and Spain in no particular order. These countries did not just one day feel like imperializing their had to be a need for imperialisation. This was normally when the country was in need of money, and or other resources they would go anywhere and do anything to acquire the resource they needed. For example the French were seeking ports to trade goods so the covered a lot of west Africa coast ensuring they would have large areas of trade. But many areas did not allow countries to come in and steal their land.
Many countries had small un modern militaries setup and even though they could not defeat the modern weapons and soldiers of the invaders many of them would fight to keep their land. The natives would often through uprisings though often unsuccessful they would