The massive potato famine in Ireland brought waves of immigrants to the United States
Answer: They believed that the Natives were "savage beings who lived like animals"
Explanation: You are correct, they weren't nice to natives. It is because the European's had not been accustomed to seeing people who were quite as different as them and therefore they saw themselves as better than the natives ( this is also how racist Europeans saw Africans, hence why slavery started). They didn't respect the Natives' ways and thought that they had the right to take the land even though it rightfully belonged to the Natives.
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The option which is not a reason given for the Protestant Reformation is D. Martin Luther wanted to be Pope.
He never wanted to become Pope, he just wanted to create a reform of the Protestant Church so as to avoid selling of indulgences, among other things. He thought that the Pope was incompetent, and that due to the extreme importance of tradition in religion, something had to be changed.