I think it was the Age of Discovery. After the Crusades and the fall of Feudalism,
the growth of towns and commerce attracted interest in other lands that began
during the Crusades when they were exposed the silks and spices being traded
there. This prompted European powers to
embark on journeys to establish trade routes as well as find new lands to
colonize.
It's began with the Spanish American war
Iron Curtain: A term coined by Winston Churchill about the Soviet hold on Eastern Europe
Truman Doctorine: <span>principle that the US should give support to countries or peoples threatened by Soviet forces or communist insurrection.
Marshall Plan: Giving supplies and loans to struggling nations (Notably recovering Germany) to help them build up</span>
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.
The main causes of Shays' Rebellion all had to do with anger of tax and debt collection, which showed that the early United States had a very hard time exerting power over the individual states and the populations of these states.
