On September 2, 1874 former President of the Confederacy, Jefferson Davis, delivered a speech in Memphis, Tennessee denouncing a massacre of sixteen black men a week prior in Trenton, TN.
To say for any reason that the United States should not have entered the Second World War is ludicrous. We were presented with the very real threat of anti-Semitic fascism taking control of Europe and the world. We had to enter, to save the vote of the people and of society.
Mexico never considered going to war with the US, and America declared war because Germany was so desperate to buy time in Europe that they were willing to violate the borders of the United States. Economics had little to do with the reasons the US joined the allies.