From my perspective, I've noticed that historians usually divide Christianity into Catholicism or Protestantism.
The U.S. sided with democratically based governments, especially after Nazi Germany attacked France and Britain. Pearl Harbor was an attack on the U.S.
White supremacy I would think.. I maybe be wrong. Sorry
In the Spanish colonies in America the colonists created a kind of caste system based on ethnic hierarchy which of course put the Spaniards on top. The rest of ethnic groups ranked based on their resemblance of the Spaniards so for example the Indians would be ranked higher than Blacks as they more resembled the Spaniards.
Merchants believed that the slaves were less than animals, therefore they needed less than animal conditions.