The war was fought because America was built upon slavery. During the Industrial Age, the northern economy no longer needed slavery. The south however was wasn’t ready nor was trying as hard to give up its dependency on slavery. The south economy would plummet and life for southerners would drastically make a down spiral if they couldn’t have access to expensive but efficient workers you never had to pay for.
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Islam unified the Middle East economically and sometimes politically. Its had a substantial influence and has helped define the region.
Limiting competition, this is why they're frowned on today.
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From late 1940s to nowadays Israel is supported by USA and western states. Arabs were supported by Soviet Union and the eastern block to the 1980s.
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