please check my answer
Describe the major territorial advances made by the United States in the 19th Century
Ohio had been admitted by 1803 as a new state. Thomas Jefferson purchased the Louisiana territory from France in 1803, this was the Louisiana Purchase. This addition and the addition of other states doubled the size of the new nation. Jefferson obtained the outlet of the Mississippi River. In 1812, Louisiana became a state. The sates of Indiana, Mississippi, Illinois, Alabama, Maine, and Missouri were admitted to the Union. Under the Missouri Compromise of 1820, future slavery was prohibited north of the southern boundary of Missouri. In 1818 the 49th parallel was agreed upon with Britain as the border west and south of the new nation. In 1819, The Adams-Onis Treaty was agreed upon, Spain would give up Florida to the United States. Spain also gave up its long-held claim on the Pacific Northwest. This treaty also fixed the boundary between the Louisiana Purchase and Spanish territory in the West. By 1824 all the Latin American countries were independent. Texas was colonized in 1821
This is a good start. However, you don't need this sentence: By 1824 all the Latin American countries were independent.
oh ok, thanks
Your answer describes some of the major territorial advances made by the United States in the 19th Century. However, it seems to be missing some important details. Here is an expanded version that provides a more comprehensive answer:
In the 19th Century, the United States made significant territorial advances that expanded its territory and influence. Here are some important events and acquisitions:
1. Louisiana Purchase (1803): President Thomas Jefferson purchased the vast Louisiana territory from France, doubling the size of the fledgling nation. This acquisition included the territory of present-day Louisiana, Arkansas, Missouri, Iowa, Oklahoma, Kansas, Nebraska, and parts of Minnesota, North Dakota, South Dakota, New Mexico, Montana, Wyoming, and Colorado.
2. Florida Acquisition (1819): Through the Adams-Onís Treaty, the United States acquired the territory of Florida from Spain. This treaty also fixed the boundary between the Louisiana Purchase and Spanish territory in the West and resolved longstanding disputes between the two countries.
3. Texas Annexation (1845): In 1821, Texas had declared independence from Mexico, and after several years as an independent republic, it was annexed by the United States in 1845. This led to the Mexican-American War in 1846, which resulted in the United States gaining additional territories, including California and parts of New Mexico, Arizona, Nevada, Utah, and Colorado.
4. Oregon Territory (1846): Through negotiations with Great Britain, the United States settled the boundary dispute over the Oregon Territory. The 49th parallel was agreed upon as the border between the United States and British North America (present-day Canada) west of the Rocky Mountains.
5. Mexican Cession (1848): The Treaty of Guadalupe Hidalgo, signed at the end of the Mexican-American War, ceded a significant portion of Mexico's northern territories to the United States. This included present-day California, Nevada, Utah, Arizona, New Mexico, and parts of Colorado and Wyoming.
It is important to note that the expansionist policies and territorial acquisitions of the United States during this time period were not without controversy and often involved conflicts with indigenous peoples, as well as debates over the spread of slavery in newly acquired territories.