Answer:
It's a part of history,
Explanation:
It impacts on are lives today!
Imperialism necessitates control of territories, while rivalry for resources just means control of those resources.
Answer: Federalism: A system in which power is divided between the national and state governments.
Explanation:
This historian would be using the skill of "comparative analysis," since he or she is comparing a wide variety of sources to draw a conclusion between them as a group.