The United States became an empire in 1945. It is true that in the Spanish-American War, the United States intentionally took control of the Philippines and Cuba. It is also true that it began thinking of itself as an empire, but it really was not.
During the pleistocene, pluvial lakes formed in the western United States as a result of extended periods of wet conditions.
I don't get it what is the subject
B. it is a period between the beginning of the 16th centrur and continuing into the 21st centruy