Most of them were but there were some from other countries who joined them.<quoted text>
Weren't the people that conquered the Aztecs, Mayans, and incas conquistadors, from Spain?
"Georg von Speyer (* 1500 in Speyer, Rhineland; 11 June 1540 in Coro, Venezuela) was a German conquistador in New Granada, now Venezuela and Colombia. His birth name was Georg Hohermuth but he chose to call himself after his place of birth. He is sometimes referred to as Jorge de la Espira, his name in Spanish. He is a significant figure in the history of Klein-Venedig (1528 - 1546), the concession of Venezuela Province to the Welser banking family by Charles I. of Spain."