In Mexico, the Spanish had established a thriving and formidable empire. To defend Mexico from other European powers, they seized control of some northern areas.
Prior to the Treaty of Guadalupe Hidalgo in 1848 and the lesser Gadsden Purchase in 1854, the majority of the region had been a part of New Spain and Mexico.
Myself and other archaeology students in the 1970s discovered that the first humans to reach North America did so roughly 13,000 to 13,500 years ago, crossing a land bridge between Asia and Siberia. These individuals, who were the first North Americans.
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