Answer:
The ethnic mix in the Balkans was like a keg of gunpowder, and one spark could easily explode into a war that involved all of Europe.- third choice
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Slave Labor
Otherwise known as the unpaid labor of enslaved workers.
The answer to your question is,
A prime meridian is a meridian in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its antimeridian form a great circle. This great circle divides the sphere, e.g., Earth, into two hemispheres.
-Mabel <3