New Spain was established after the Spanish conquest of Mexico to give the Spanish crown control over the region. It was led by a Viceroy with limited power who was advised by an Audiencia. Gold and silver were the main exports, and New Spain became highly urbanized with over 200 towns by 1628. Starting in the 1530s, the Spanish began exploring North America in search of gold and silver, led by explorers like Cabeza de Vaca, Hernando de Soto, and Francisco Vasquez de Coronado, though they found no major riches. The Spanish then focused on establishing the colony of Florida in 1565 to counter the French, but other than St. Augustine, these early colonies failed