Answer:
Because the following month, Germany sunk four more U.S. merchant ships. On April 6, 1917, the United States entered World War I. Get a firsthand look at how a new breed of weapons like WMDs, submarines, armored tanks and air attacks changed modern warfare forever in WWI: The First Modern War.
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Answer:
The disarmament conference of 1932-3 failed because Germany refused to agree with it.
Explanation:
The Disarmament Conference tried to reduce weapons. Many nations during the 1930s were increasing their arms and ammunition. The conference held for the reduction and limitation of armaments. After becoming Chancellor of Germany, Hitler attended the disarmament conference. It failed as h stood against it as it was unfair to Germans when Britain and France were not ready to lessen their weapons. He further claims that the French refusal to disarm was proof of invading Germany in future. He withdrew the German delegation to the conference and left the League of Nations in 1933.
Answer:
Because of it's importance in current time.
Explanation:
They choose the cases that have the biggest importance at that time and impact.