Respuesta :
Answer:the Louisiana Purchase from France in 1803, Florida purchased from Spain in 1819, the Texas annexation in 1845, the Oregon Country acquired by the treaty with Great Britain in 1846, the Mexican cession of western territories in 1848, and the Gadsden Purchase in northern Mexico in 1853.
Explanation: Hope this helps
They gained sizable Mexican territory in the Mexican-American war, but not all of the country was annexed. Texas, however, was fully annexed and admitted as a state in the union.