The conflict in Argentina known as the dirty war occured in the 1970s and 1980s.
Answer:Sinking of American merchant ships
Explanation:In early 1917 Berlin forced the issue. Its declared decision on 31 January 1917 to target neutral shipping in a designated war-zone became the immediate cause of the entry of the United States into the war.
The answer is A. They had an alliance called the blank check with them
