During the early part of the 21st century, the U.S. military was deployed to Central Asia and Middle East in order to build stable democracies and to remove dictators in oppressive states.
It should be noted that a dictator simply means a ruler who doesn't abide with existing rules and doesn't really care about its people.
In this case, during the early part of the 21st century, the U.S. military was deployed to Central Asia and Middle East in order to build stable democracies and to remove dictators in oppressive states.
Therefore, the correct option is D.
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