John Cabot was an Italian merchant who explored North America in the late 1400s while seeking a northwest passage to Asia, making him the first European to rediscover North America since the Vikings. Amerigo Vespucci explored South America and concluded it was a separate continent from Asia, leading to it being named America. Juan Ponce de Leon was a Spanish soldier who landed in Florida in 1513, becoming the first to set foot on the continental United States.