<u>The outbreak of the Second World War happened.</u> The rise of fascism in Italy and Germany worried Roosevelt for what was preparing the country for a war. In the Second World War he sided with France and Britain helping these countries economically breaking the law of neutrality of the United States.
In 1830 Congress, urged on by President Andrew Jackson, passed the Indian Removal Act which gave the federal government the power to relocate any Native Americans in the east to territory that was west of the Mississippi River.
The Union used its number of ships to keep the south from exporting or importing its goods to foreign countries. It also used the ships to spread slave-revolt propaganda to convince European countries to not to trade with the South so they'll be economically weak to provide their soldiers with nessecary equipment such as weapons, food, and clothing. The union also used its wealth to buy southern loyalties to block south' sports to weaken confederates further more. Also, the North had railroads which the government bought from different companies to provide transportation to their men faster along with weapons. They also had many inventors who came up with gadgets and codes to help the army.
The massive migration and the subsequent rapid settlement of the continental USA were fueled by the Gold Rush, the Oregon Trail (large-wheeled wagon road and emigrant trail in the United States that combined the Missouri River to valleys in Oregon) and a belief in "manifest destiny", the idea that its settlers were designed to expand across North America. This expansion began with the Louisiana Purchase in 1803. The president Thomas Jefferson bought the territory from the French for $15 million, and worked in the creation of an expansionist mentality. As a result this migration is also called Westward Expansion.
Average balance account is your answer