Austria-Hungary invaded serbia after the assassination of the arch duke Ferdinand. This started World War 1.
As the Cold War heated up in the 1950s, the United States made decisions on foreign policy with the goal of containing communism. To maintain its hegemony in the Western Hemisphere, the U.S. intervened in Guatemala in 1954 and removed its elected president, Jacobo Arbenz Guzman, on the premise that he was soft on communism.
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.
<u><em>Many were displeased, which increased tensions over slavery. </em></u>
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I don't know fully so I'll narrow it down to two answers.
B and D, I'm sorry for not giving the correct answer
