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Many things, but one was Austro-Hungarian domination in the Balkans.
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Langston Hughes contributed to world war II by writing jinggles to incourage purchases of war bonds.
World War I changed the alliance system in Europe and had grave mental, economic, and political consequences for Germany that contributed to Hitler's rise to power.
Europe
The increased investment in European militaries
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Many things, but one was Austro-Hungarian domination in the Balkans.
One of them is the assassination of Franz Ferdinand.
Alliances and army :)
Yellow journalism contributed to the start of the Spanish American War by exaggerating or making things up about the problem. These articles aroused public anger at the Spanish, leading to war.
missles
civil war.
Civil war
Several things contributed to the start of the War Between the States. The most immediate cause was the South firing on Fort Sumter. The next direct cause was the secession of the southern states from the Union.
A number of factors contributed to the start of WW2. - Hitler's rise to power, - Polictical, economic and other causes led to the war.
Woodrow Wilson