The spanish gov't favored the peninsulares over the creoles, often rewarding them with powerful gov't positions.
It was the "B. Plebeians" who made up the majority of the roman population and became citizen-soldiers during the time of war, since these were the "common" people as opposed to the elite.
<span>Corps of Discovery Expedition</span>
The correct answer should be Advances in Technology and Industrial revolution
Mexican-American war happened in the 40s so that's before 1860, while a war with Spain occurred in 1898 which is after the mentioned period. They did advance in technology exactly due to the industrial revolution. An agrarian revolution. An agricultural revolution didn't happen in the US because of the Long depression that slowed it all down.
Federalists wanted a strong federal government. But the Anti-federalists thought if the power was too concentrated to the national government, it would take away the power of the state and the position of the presidency would become a monarchy.