Citizens <em>directly</em>participating in their government is a C. direct democracy
In the classic sense, American imperialism is a myth. The US never had a policy either stated or understood of importing cheap raw material and requiring vassal states or colonies to accept expensive manufactured goods, as did for England. The dominance of American culture and products in the mid 20th century was mostly the result of people in other nation craving the standard of living enjoyed in the world's largest democracy.
Just going off what i learned from Age of Empires... The Bronze Age
