How did the Spanish increase their knowledge of Texas in 1519?

In 1519, the explorer Alonso Álvarez de Piñeda became the first European to map the Texas Gulf Coast. However, it would be another nine years before any Spaniards explored the Texas interior. The first Europeans to view the diversity of the landscape and people of what we now call Texas. Moving between the mainland and the coast, Cabeza de Vaca worked as a trader and healer to survive, with the ultimate goal to make it to Mexico City.

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b.   jim crow laws were enacted in northern states.