A map showing the continental United States. Areas designated on the map include the original 13 colonies, the Florida Territory, the Louisiana Purchase, the Texas Annexation, Mexico, the Mexican Cession, The Oregon Territory, and the Gadsden Purchase. On the map above, review the territory gained by the United States through the Gadsden Purchase. How did the Gadsden Purchase most likely affect trade?

It prevented overseas trade with Texas.
It allowed Mexico to trade with Asian countries more easily.
It kept Native Americans tribes from trading with each other.
It provided the U. S. with a southern route for transcontinental trade.