What was the pope's unspoken assumption when he drew the 1494 Line of Demarcation on the globe?

Question

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The pope's unspoken assumption was that only Catholic Christians had any rights that Europeans had to respect, which is why the Line of Demarcation was drawn to divide the newly discovered lands outside Europe between Portugal and Spain, both Catholic nations, without regard for the rights of the people living in those lands.

What Was the Pope's Unspoken Assumption When He Drew the 1494