Spanish-American war was that the US was fighting to gain control of a territory... earlier wars were the US taking back power from Britain
The first major domestic crisis of the US government under the Constitution resulted from the federal government exercising its new right to tax the states in order to bring in more revenue to pay down the war debt.
It took more than 1,000,000 men to build the Great Wall of China. They took several years. Around 2,000 years to be exact.
The answer for this usa test prep video is Union Pacific