Feudalism is the political system being described?
It was a mixture of various reasons, although for the Spanish and Portuguese it was a question of reaching India for spice trades after the embargo instated on them by the Ottoman Turks.
The Portuguese went around Africa, and the Spanish tried sailing west across the barren ocean, and accidentally discovered America through Columbus.
I think the difference is caused by a person or group actually going through with genocide versus an attempt at it, but that's just my best guess?
Bye running from them far to the daddy say get key