Because he was mean to his brother
The agreement with Viceroy Velasco tasked Oñate with two goals; the better-known aim was to explore and colonize the unknown lands annexed into the New Kingdom of León y Castilla (present day New Mexico) and the Viceroyalty of New Spain. His second goal was to capture Capt
King James would not give the Separatists a charter because he did not want them to practice their own religion there.
