The reason why spanish contact with Incas drove capitalism in Europe is multifold. After being exposed to the riches of the Incas empire, more and more ships were created in Europe (introducing more producers of ships and shipping supplies, etc.) because more and more people wanted to go to the New world themselves and exploit the riches that were available there.
The ensuing Mexican–American War was waged from 1846 to 1848 with the loss of many thousands of lives and the loss to Mexico of all of its northern provinces.
The answer is 1 because the Missouri compromise, although a compromise, created more tension between the north and the south. Although the both sides got 1 state, the tension based off of slavery continued since neither side backed down and issues weren’t resolved.