The US role played in the Vietnam War was C. The US became involved because they feared that other countries would fall to communism like dominoes. The Vietnam War was the longest war fought by the US in its history until the War in Afghanistan surpassed it recently. Involvement began slowly at first but gradually ramped up resulting in a widespread feeling of war weariness in the US where activists began to actively oppose war efforts and speak out against involvement on the whole.
Your answer that fills in the blank is: Social Security.
The best and most correct answer among the choices provided by your question is the first choice.
The map describes the Louisiana Purchase.
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