Answer:
B.) Submarines
Explanation:
Germany broke its promise to the United States to stop attacking passenger ships (unrestricted submarine warfare). German leaders knew America entering the war would increase the strength of Allied Powers.
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Germany betrayed its promise to the United States by continuing to target civilian ships (unrestricted submarine warfare). German officials understood that America's entry into the war would strengthen the Allied Powers. As a result, option (B) is the true solution.
How did the US join World War II?The United States had been on the outside of World War II for two years prior to the attack on Pearl Harbor in December 1941, which drew the country into the battle.
The start of WWI was less complicated than the start of WW2. The five-strong major European powers were swiftly drawn into hostilities after a 'big bang' outbreak in August 1914.
The United States' entry into World War I was likewise less complicated than the United States' entry into World War II. By 1917, there was little opposition to participating in the war. President Woodrow Wilson requested a declaration of war against Germany in April, partly in response to Berlin's doctrine of unrestricted submarine warfare (sinking commercial ships without warning).
Hence, option (B) is accurate.
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