The Native Americans, The English, French, Spanish, Dutch, Danish, Germans, ...pretty much all the European nations.
Lewis and Clark explored the Louisiana Territory.
He only explored the east coast of Canada.
Coronado explored the southwestern US, while de Soto explored the southeastern US.
Twelve US astronauts have explored the moon as part of the Apollo missions between 1969 and 1972.
The Spanish.
Spain
Spanish
Spanish
Spanish
The Moon since NASA was in the US
No he did not, I studied him and their is no official report that he explored Mexico, he explored the border of Canada and the US
Spain.