The correct answer should be "Moral obligation to bring Western Civilization to less developed areas".
This was a justification and the way they presented it in public. It was especially prominent in Spain as they said that they were expanding for Christianity whereas they really wanted gold from colonies.
High tariffs on industrial products I think.
The Americanization movement was a nationwide organized effort in the 1910s to bring millions of recent immigrants into the American cultural system.
Explanation:
The 13th Amendment banned slavery and all involuntary servitude, except in the case of punishment for a crime. ... The 15th Amendment prohibited governments from denying U.S. citizens the right to vote based on race, color, or past servitude.