What is domino theory? how did domino theory impact the us involvement in the vietnam war

The domino theory was believed that if one country went communist, the rest of the countries around them would also join them and be communist. In the vietnam war however, the domino theory was the basis of containment for the United States. This containment strategy was to stop communist aggression in South East Asia. I hope this helps!

A, if I am wrong delete my awnser, but I beleive im correct because domino means that when a domino falls it knowcks others over, affecting everyone.

Explanation:

answer; (d) i believe that the correct answer is americans finally ran out of ammunition;