D) It convinced the government to become involved in the war.
Explanation:
The "domino theory" held that if one nation fell to communism then the others around it most likely would. This philosophy's influence is that it convinced the government to become involved in the war which dragged the United States into the civil conflict in Vietnam
Paine had the disadvantage because he was born in a different country but he also had the advantage because he helped the colonies become stronger and Jefferson had the advantage because he got the french to help during the war