U-boats were used primarily to?

U-boats were military submarines used by the Germans. While they were useful against warships, U-boats were the most effective in economic warfare by blockading coasts so resources could not be shipped to Germany's allies. WWI was the first major war that employed submarines in warfare.

Please mark brainliest if this helped :)

the following best describes postwar era writers in their works:

progressive

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