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How did battles in the Balkans build the tension that would lead to war?

two successive military conflicts that deprived the Ottoman Empire of all its remaining territory in Europe except part of Thrace and the city of Adrianople (Edirne). The second conflict erupted when the Balkan allies Serbia, Greece, and Bulgaria quarreled over the partitioning of their conquests. The result was a resumption of hostilities in 1913 between Bulgaria on the one hand and Serbia and Greece, which were joined by Romania, on the other.

Explanation:

your answer is 1930's

explanation

this is just around the time the great depression was starting and putting the us ecnomy into ecnomic failure causing the goverment to take a much larger rule to try and pieace it back together