A Treaty To Provide Joint Mexican And American Protection For The Sloo Grant Is Signed

On March 21, 1853, a treaty, initiated in the Fillmore administration, that would provide joint Mexican and American protection for the Sloo grant was signed in Mexico.

At the same time that this treaty was received in Washington, Pierce learned that New Mexico Territorial Governor William C. Lane had issued a proclamation claiming the Mesilla Valley as part of New Mexico, leading to protests from Mexico. Pierce was also aware of efforts by France, through its consul in San Francisco, to acquire the Mexican state of Sonora.

# Gadsden Purchase of 1853, United States purchased a strip of land along the U.S.-Mexico border for $10 million, now in New Mexico and Arizona. This territory was later used for the southern transcontinental railroad.