Which statement about the geographic changes in early American history is correct? Responses The United States doubled its size by winning the Mexican-American War. The United States doubled its size by winning the Mexican-American War. The United States gained the area of Texas during the Louisiana Purchase. The United States gained the area of Texas during the Louisiana Purchase. The United States gained access to the Mississippi River from the original thirteen colonies in 1770. The United States gained access to the Mississippi River from the original thirteen colonies in 1770. The United States gained the Oregon Territory in the era of Manifest Destiny during the Polk presidency.