You really should be catching up on your US History because those who fail to learn from history are doomed to repeat it, and we really don't want that now, do we?
Here are our US History pages for the early eras of Native Americans and the European "exploration" which some would suggest was less exploration than a European invasion and subjagation of native peoples who lived in the Americas at the time. Here at US History and Travel we'd rather have people argue that issue here in the blog comments rather than try to force our opinion on you:
US History through 1630:
Early America Pre-contact.
Native American Origins and Cultures.
Early Exploration of what is now the USA:
The Spanish. The French. The English. Roanoke Island. Jamestown. Leif Ericksson. Christopher Columbus. John Cabot. Sir Francis Drake. Jacques Cartier. Henry Hudson.