He was motivated by the fame and fortune that he would get if he discovered new lands. The queen of Spain had also promised that he could rule any lands he found.
Columbus appealed to Ferdinand and Isabella's motives of spreading Christianity, gaining economic wealth, enhancing national prestige, and competing with Portugal to secure their support for his expedition. His persuasive arguments combined religious zeal with the promise of riches and glory for Spain. Ultimately, this blend of motives successfully convinced the Spanish rulers to finance his voyage in 1492.
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