The leading argument against slavery during this time in the US was simply that it was immoral, and went against God's will. Another was that it violated the Constitution, and yet another was that it was unsustainable in the South.
It happened right after world war one when Germany was left in ruins due to the war and Hitler proposed a new ideology of Naziism which everyone started to like due to the situation Germany was in at the time.
the Mexican government believed they would benefit because they would get more land and more profit
