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What was the cause of the soveit afgan conflict

In December 1979, in the midst of the Cold War, the Soviet 40th Army invaded Afghanistan to prop up the communist government of the Peoples Democratic party of Afghanistan ( PDPA ) against a growing insurgency. The Soviet Union feared the loss of its community proxy in Afghanistan.

Explanation: I may be in middle school, but I love researching stuff!

nafta and the union are used as a trade between other countries these   organizations are used as spokes person for the country