Answer
The Zimmerman note finally turned the eyes of the American public towards declaring war on Germany, they finally snapped after Germany's attacks on a American ships.
A feeling of strong devotion to one's country is called : nationalism
People with nationalism principle tend to be capable to do anything in order to bring benefit to their country, such as waging war, conquering more territory for the country, etc
hope this helps
Barbarians destroyed a lot of the documentation in 390BC, Historians now are left to piece the puzzle and grasp an understanding based on the evidence left
