Was Ponce de Leon the first European explore to explore land that became prt of the United States?

Yes, I believe so.

No, Ponce de Leon was not the first European explorer to explore land that eventually became part of the United States. The first European explorers to reach and explore parts of what is now the United States were actually the Vikings, specifically Norse Viking Leif Erikson. He is believed to have landed in present-day Newfoundland, Canada, around the year 1000 AD.

If you are interested in learning about historical events, it's beneficial to find reliable sources like history books or well-established websites. You can consult books such as "A Short History of the United States" by Robert V. Remini or "A People's History of the United States" by Howard Zinn. For online sources, you can refer to websites such as the Library of Congress, National Geographic, or reputable educational websites like Britannica or History.com. By using these resources, you can gather accurate and detailed information about historical events and figures.