In the 1840s, the U.S was struck with the idea of <em>manifest destiny</em>. An idea that America should control North America from the Atlantic Ocean to the Pacific Ocean. Mexico had the legal right to Texas thus dominated California, Arizona, and New Mexico. Two territories stood in America's way of accomplishing the manifest destiny idea; first, the Oregon Territory that was occupied by both Great Britain and the United States and the Western and Southwestern areas owned by Mexico. The differences between the United States and Mexico over the border of Texas led to the Mexican American War that resulted in American gaining ownership of Arizona, California, New Mexico, and Texas. The ownership of these territories fulfilled the '<em>Manifest Destiny' </em>of the U.S stretching from the Atlantic to the Pacific, Manifest Destiny.
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A very important cause of the cause of the American Civil War was the election of Abraham Lincoln. Lincoln wanted to abolish slavery and the Southerners did not want to be ruled by an anti-slavery Northerner. ... The amount of deaths/casualties in the American Civil War is also a very important effect
The Great Migration was the relocation of more than 6 million African Americans from the rural South to the cities of the North, Midwest and West from about 1916 to 1970.
<span>The second treaty of Fort Laramie signed in 1868 ended the Red Cloud's War. The second treaty of Fort Laramie is also known as the Sioux Treaty of 1868. The treaty also declared that the Black Hills of Dakota as part of the Great Sioux Reservation and should only be exclusively used by Sioux Indian population. But the treaty was a failure.</span>
