Because Obama said so
The unequal distribution of wealth causes much political unrest.
Societal and political unrest
political unrest is a disturbance or turmoil; also known as agitation.
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a
There was political unrest.
Mesopotamia is now Iraq. The country is currently in a state of unrest.
There was political unrest.
Political unrest
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Some countries that experienced political unrest in the 1990s include Rwanda, Bosnia and Herzegovina, Somalia, and Russia. These conflicts ranged from civil wars and genocides to political upheavals and revolutions.