What is imperialism?
Imperialism is a policy of extending a country's power and influence through diplomacy or military force. Get more information here:http://en.wikipedia.org/wiki/Imperialism :)
Basically it's when a country expands it's empire beyond it's boarders by taking over and occupying other lands. That's what England and Spain did in America.
Imperialism can be defined as the policy of extending the power and influence of a country. This can be through military force or diplomacy and it is normally between states. You can check this out at http://en.wikipedia.org/wiki/Imperialism.