Final answer:
Juan de Sepulveda supported Spanish imperialism and the subjugation of indigenous peoples in the Americas, in contrast to Bartolomé de las Casas's more compassionate stance.
Step-by-step explanation:
Juan de Sepulveda, a 16th-century Spanish philosopher and theologian, wrote and supported the idea of Spanish imperialism and the subjugation of indigenous peoples in the Americas. He argued that the Native Americans were barbaric and in need of European conquest and colonization. Sepulveda's views were in opposition to the more humane and compassionate stance advocated by figures like Bartolomé de las Casas, who fought for the rights and fair treatment of indigenous peoples.