Answer :
The United States did not directly engage in battle.
In order to answer this you need previously to know that by a proxy war:
by definition:
is an armed conflict between two states which act on instigating third parties, usually setting terrain where hostilities take place. there must be a direct, long-term relationship between external actors and the belligerent groups involved.
Clearly there was no direct fighting between Soviet and American troops, still, the mujahedeen were economically assisted and tactically aided by Us officers whereas, to the counterpart, the communist local government that was supporting assistance from the Soviet side also was given financial and military assistance. In this ideological confrontations, the external powers do not engage in open and direct warfare, rather, the intermediate or states in between are the terrain for the war to be carried.
The reason that Soviet-Union fighting in Afghanistan was considered as proxy war because there was no direct involvement of the United States in this war
Further Explanation:-
The Soviet-Afghan war took place between the period of 1979 to 1989 for nine years and this war was between Mujahidin along with small Maoist groups who were against the republic of Afghanistan as well as had issues with the Soviet Republic. Saudi Arabia, Pakistan and the United States were the countries that we're backing the groups of Mujaheddin and that made this war a cold war proxy war. After the saur revolution ended, there was the formation of the Democratic Republic of Afghanistan and that the government had pro-poor and pro-farmer agenda. Democratic Republic of Afghanistan also enjoyed close relations with the Soviet Union and in 1978, a treaty of friendship was signed between these two countries to support each other during the period of this war.
Adolph Dubs who was US high commissioner in Afghanistan was kidnapped and killed by Setami Milli militants in 1979 and this brought an increase in tensions between Afghanistan and the United States as Adolph Dubs was United States Ambassador to Afghanistan. He was killed in an assault which was carried out by Afghan police and that assault was advised by the Soviet Union.
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Answer details:
Grade – High School
Subject – History
Chapter – Proxy War
Keywords – Proxy War, United States, Soviet Union, Afghanistan, Pakistan, Proxy War, Saudi Arabia, Adolph Dubs, Mujaheddin, Battle