Answer:
The Answer is Unprecedented presidential control of U.S. military forces
Explanation:
Congress gave LBJ the ability to take all necessary measures to protect U.S interests in Vietnam in the Tonkin Gulf Resolution. This led to the build-up of U.S forces in Vietnam because LBJ wanted to expand operations in Vietnam.
The Emancipation Proclamation only freed the slaves in the Confederate states, therefore encouraging them to rise up.
Hmph..<span>The death toll from the plague led to labor shortages.
Love, grace-
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