Who is the president of united states

List two inventions that were invented in the united states before the american civil war

(05.04 mc) how did the roman transportation system keep the empire strong? plz

How did the spanish-american war affect american expansionism? a.) america took control of hawaii, cuba, and the pacific islands of guam. b.) america took possession of cuba and the philippines. c.) america gained control of puerto rico and hawaii. d.) america gained control of cuba, puerto rico, the pacific island of guam and the philippines.