1. Land Added to United States
Original Territory: (From Great Britain in Treaty of Paris, 1783) 843,255 sq. mi.
Louisiana Purchase: (From France by Treaty, April 1803) 891,405 sq. mi.
Land Added during Polk’s Administration:
Texas (Joint resolution, Dec. 1845) 389,752 sq. mi.
Mexican Cession ( From Mexico in Treaty of Guadalupe-Hidalgo, Feb. 1848) 527,122 sq. mi.
Oregon Territory (From Britain by Joint Agreement, 1846) 285,836 sq. mi.
Total land acquired during Polk administration: 1,202,710 sq. mi.= 311,305 more than Louisiana Purchase.

2. Louisiana Purchase