Cause:
Toward the west development had been an American need before the nineteenth century. When the English colonized North America, they wanted to overcome the huge wild toward the west.
U.S. President Thomas Jefferson's Louisiana Purchase in 1803 had multiplied the size of the nation, starting individuals' craving to move west.
Spreading settlements along the nation's lines caused grating with others. The intercession of the U.S. government regularly brought about the extension of more domain.
Effects:
Before the finish of the Mexican-American War in 1848, the United States had stretched out sway from the Atlantic to the Pacific Ocean and from the 49th equal on the Canadian line to the Rio Grande in the south.
Native populaces endured equipped clash and constrained migration.
The scantily populated western locales of the landmass got collapsed into a country with huge potential for power. The countless pioneers who moved west settled new networks.
New domains gave the nation admittance to more prominent normal assets and the Pacific exchange. However, the obtaining of new regions additionally resuscitated the discussion over bondage and its extension, an issue that would prompt the flare-up of the American Civil War in 1861.
