Which present-day state was not part of the Mexican Cession under the Treaty of Guadalupe Hidalgo?

Which present-day state was not part of the Mexican Cession under the Treaty of Guadalupe Hidalgo?

• A. Arizona
• B. California
• C. Nevada
• D. Oregon

Answer: (D)

The main idea is understanding how land was transferred after the Mexican-American War. The Treaty of Guadalupe Hidalgo in 1848 created the Mexican Cession, which added most of the American Southwest to the United States—areas that are now California, Nevada, Utah, Arizona, New Mexico, Colorado, and Wyoming (and parts nearby). Oregon, however, was already being claimed by the United States through the earlier 1846 Oregon Treaty with Britain, which set the northern boundary at the 49th parallel. That means Oregon wasn’t part of the Mexican Cession. So among the options, Oregon is the one that doesn't fit with lands ceded by Mexico under that treaty.

The main idea is understanding how land was transferred after the Mexican-American War. The Treaty of Guadalupe Hidalgo in 1848 created the Mexican Cession, which added most of the American Southwest to the United States—areas that are now California, Nevada, Utah, Arizona, New Mexico, Colorado, and Wyoming (and parts nearby). Oregon, however, was already being claimed by the United States through the earlier 1846 Oregon Treaty with Britain, which set the northern boundary at the 49th parallel. That means Oregon wasn’t part of the Mexican Cession. So among the options, Oregon is the one that doesn't fit with lands ceded by Mexico under that treaty.