Answer:
1. Louisiana Purchase - 1803, purchase from France.
2. Texas Annexation - 1845, Wanted to be admitted to the Union
3. Oregon Territory - 1846, dispute between the United States and Britain. They both claimed the entire area yet the settled at the 49th parallel
4. Mexican Cession - 1848, War broke out between Mexico and the USA over the dispute over Texas. The USA won the war and took a sizeable amount of land from Mexico.
5. Gadsden Purchase - Finalized in 1854, the land was needed for a southern transcontinental railroad.
Step-by-step explanation: