テキサス併合
In 1907, Theodore Roosevelt in a Presidential Proclamation (35 Stat. 2136) established the reservation in order to keep all public lands along the border in California, Arizona, and New Mexico "free from obstruction as a protection against the smuggling of goods between the United States and Mexico". Texas was excluded because Texas retained all public lands upon the Texas annexation and admittance as a state, much of which has been sold over the years to private parties.