It can be a good example of a lot of things... richness, nationalism...
Many Americans were against getting involved in a War that was being fought in Europe though begrudgingly Americans became aware there was danger on the High Seas as Atlantic waters became host to submarines while warships dueled in the waters of the South Pacific and Atlantic.
Many Americans, particularly the Wobbles, the IWW International Workers of World (rightly) argued that the main reason for fighting would be to profit by various means profits that would mostly land in the pockets of International Bankers and Industrialist, the Halliburton of the times.
A humanitarian is a person who seeks to promote the welfare of others, especially by the generous donation of money to good causes. It doesn't say anything about their diet.
The country on the southern border of the United States is Mexico.