Who was President when Texas, the Oregon Territory, and the Mexican Cession were added to the United States?
A. John Tyler
B. James K. Polk
C. William Henry Harrison
D. Zachary Taylor
The Annexation of Texas, the Mexican-American War, and the Treaty of Guadalupe-Hidalgo, 1845–1848. During his tenure, U.S. President James K. Polk oversaw the greatest territorial expansion of the United States to date.
