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1800 United States presidential election
Thomas Jefferson defeated John Adams with a 73:65 electoral vote and became president. -
Louisiana Purchase
The United States purchased Louisiana from France for $15 million and expanded its sovereignty on the Mississippi River, almost doubling the nominal size of the country. -
New Jersey Passes Law Delaying End of Slavery
New Jersey passed a law providing for the "gradual emancipation of slaves" on February 15, 1804, and in doing so became the last Northern state to begin the process of ending enslavement within its borders. -
Adams–Onís Treaty
A treaty between the United States and Spain in 1819 that ceded Florida to the U.S. and defined the boundary between the U.S. and New Spain. -
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1824 United States presidential election
The result of the election was inconclusive, as no candidate won a majority of the electoral vote. Under the provisions of the Twelfth Amendment, held a contingent election. On February 9, 1825, John Quincy Adams was elected as president. -
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Texas Revolution
After a decade of political and cultural conflict between the Mexican government and the growing number of American immigrants in Texas, the revolution began in October 1835. The Mexican government has become more and more centralized, and the rights of its citizens have been increasingly restricted, especially with regard to immigration from the United States. This revolution finally made Texas independent and became the Republic of Texas -
Texas annexation
The Republic of Texas announced its separation from the Republic of Mexico on March 2, 1836. It applied for annexation by the United States in the same year, but was rejected by the Secretary of State. At that time, the vast majority of Texans were in favor of the United States' annexation of the Republic. US President John Tyler alone decided to implement the annexation plan of Texas and let him remain for another four years. Texas became the 28th state in the United States on December 29, 1845 -
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Mexican–American War
The United States sought to buy territory from Mexico from 1825. US President Andrew Jackson has continued his efforts to acquire northern Mexican territory, but without success. The annexation of Texas brought opportunities for the U.S. government. A war broke out between the United States and Mexico, ending with the defeat of Mexico. After the end of the war, the United States took over a large number of Mexican territory and successfully expanded it.
