Question

which country was the only ally the u.s. could truly help when entering the war in europe in 1942? russia poland great britain

Explanation:

In 1942, when the U.S. entered the war in Europe, Great Britain was in a position where the U.S. could effectively provide assistance. Russia (USSR at that time) was also an ally, but logistical and strategic factors made Great Britain the more immediately supportable ally among these options, and Poland was under Nazi occupation, so the U.S. couldn't truly help it in the same way.

Answer:

Great Britain