was the official name for the american military force sent to aid the british and french in 1917.

American Expeditionary Force

Explanation:

On September 12, 1918, the American Expeditionary Forces (AEF) under General John J. Pershing launched their first major offensive in Europe as an independent army. Their successful campaign was a major turning point in the war for the Allies. Ultimately, U.S. forces helped to defeat Germany earlier than expected.

The American Expeditionary Force was the U.S. military in Europe during World War I. Under the command of Major General John Pershing, its regiments came in to support and later lead the Allied forces in Europe, its fresh soldiers outnumbering the Germans they fought against.

World War I was the first time in American history that the United States sent soldiers abroad to defend foreign soil. ... In May 1917, General John Joseph "Black Jack" Pershing was designated the supreme commander of the American army in France, and the American Expeditionary Forces (AEF) were created.

the following best describes postwar era writers in their works:

many writers,authors,novelists,poets concentrated more on social art and social writing and stayed away from political writings.

a memoir is the correct answer