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In 1818 settlers in Missouri requested admission to the Union, Northern and Southern's disagreed, however on whether Missouri should be a free state or a slave state. Behind the leadership of Henry Clay, congress passed a series of agreements known as the "Missouri Compromise" under this agreements Maine was admitted a frees state and Missouri as a slave state. The rest of the Louisiana Territory was split into 2 parts, the dividing line was set at 36 degrees 30' north latitude and the south of the line was slavery legal North of the line except in Missouri, slavery was banned.

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From about 1811-1840 the Oregon Trail was laid down by traders and fur trappers. It could only be traveled by horseback or also by foot.However, by 1836, the first of the migrant train of wagons was put together. It started in Independence, Missouri and traveled a cleared trail that reached to Fort Hall, Idaho.

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The Texas Annexation of 1845 was the incorporation of the Republic of Texas into the United States of America, which was admitted to the Union as the 28th state on December 29, 1845.

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In January 24, 1848 a carpenter named James Marshall discovered few shiny particles lying near John Sutter's sawmill. He took what he found to Sutter and who confirmed that the particles was gold. Soon more gold was found by other workers  at Sutter's Mill, and news began to spread quickly. When the news reached San Francisco, the whole town went to the Sacramento Valley to look for gold. As the gold "fever" traveled eastward, overland migration to California rose from 400 in 1848 to 44,000 in 1850 by the end of 1849 the population was exceeded. The discovery of the gold revolutionized California's economy which gold financed the development of faring, manufacturing, and banking. The gold rush was over by 1853 most individual efforts little or no profit and those who knew how to manage made fortunes. By 1857 the total value of gold production in California approached 2 billion dollars.

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Congress, with the support of Jackson passed a law in 1830 to force all Native Americans to move west by sighning a tteat with them. Most tribes sighned the treaty but the Cherokee didnt and the Supreme court had agred not to remove them but Jackson didnt agree. Years following, U.S troops had rounded up the Cherooke and forced them into camps. Beggining of Fall in 1830, groups of 1000 walked a 800-mile journey which was named the Trail of Tears as many had died.

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in 1800, Napoleon Bonaparte of France had gained back the land that France had lost to Spain. In 1803 Napoleon had abandoned the idea of turning the Louisiana Territory into a strong American Empire and decided to sell the land to America.President Jefferson had bought the land for 15 million dollars, the Louisiana Purchase had doubled the size of the United States. President Jefferson sent Meriwether Lewis and William Clark organized and led a group to explore the new land. The explorers brought back information and proved that Transcontinental travel was possible.This is important to the U.S because it expanded the United States.