Native Americans were the first to do so. Then the first Europeans came, the Spanish. After that the Americans started exploring farther west before attaining this part of the modern day US. The French also had a short lived settlement in Texas.
It may be a reference to Garcia Lopez de Cardenas or to John Weley Powell.
Fransisco Vasquez De Coronado
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Spain.
Spain had visited and explored the land that is now the modern USA. This was well before the Spanish settlement of St. Augustine Florida. St. A. was settled approx. 1565 and is credited as the first permanent settlement in the US.
Christopher Columbus explored the new world.
I know they explored the pacific
Portugal explored the New World first