No.
President Polk sent troops to Mexico to seize the Oregon Territory, which began the Mexican War that the U.S. ultimately won to acquire Oregon.
Oregon. New Mexico was part of Mexico until 1848 and Idaho was part of Oregon until 1846.
No. The territories lost by Mexico didn't include Oregon.
1846
A large territory that was formerly part of Mexico became the states of Arizona and New Mexico. They joined the Union in 1912.
It was a colony of Spain, but Mexico never was part of Spain's territory.
No. It was part of Mexico, but was considered a different territory than Chihuahua.
The territory of Texas.
One of the states formed from the Oregon Country is Oregon itself. Oregon was established as a state in 1859 as part of the Compromise of 1850, splitting from the larger Oregon Territory. The territory was initially jointly occupied by the United States and Britain until a boundary was established at the 49th parallel in the Oregon Treaty of 1846, paving the way for Oregon's statehood.
The Oregon Territory became part of the United States in the 1840's just before the Civil War. The discovery of the Oregon Trail led to many wagon trains and settlers going to Oregon Territory.
The Territory of New Mexico existed from September 9, 1850, until January 6, 1912, when the territory was admitted to the Union as the State of New Mexico. Santa Fe was the capital city in the Territory of New Mexico.
Lewis and Clark explored parts of Oregon as part of the Louisiana Territory. In 1846 under President James K. Polk the U.S. signed a treaty with Britain that gave the U.S. possession of the Oregon territory.