Answer;
Nationalism convinced the people of Europe that their own nation could take on any military threat. This was a role nationalism played in the outbreak of world War I.
Explanation;
Nationalism reached a fevered pitch in Europe prior to the first World War. As a political tool, it was the belief that European technological, cultural, economic and military superiority was the cause for the subjugation of more backward economies and cultures.
The pan-Slavic nationalism inspired the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914, an event that led directly to the outbreak of World War I.
On April 6 , 1917 , the Us joined its Allies to fight in World War I.
Harsh climate no irrigation for land is possible
I think It was The National Road
The different cultures were established in Asia and carried into the Americas. B. Constant warfare among the different Native American groups led to cultural differences.