Using newly captured French ports, the German Navy enjoyed success against an over-extended Royal Navy, using U-boats against British shipping in the Atlantic. The British Home Fleet scored a significant victory on 27 May 1941 by sinking the German battleship Bismarck. In November 1939, the United States, who were taking measures to assist China and the Western Allies, amended the Neutrality Act to allow "cash and carry" purchases by the Allies. In 1940, following the German capture of Paris, the size of the United States Navy was significantly increased. In September the United States further agreed to a trade of American destroyers for British bases. Still, a large majority of the American public continued to oppose any direct military intervention in the conflict well into 1941. In December 1940 Roosevelt accused Hitler of planning world conquest and ruled out any negotiations as useless, calling for the US to become an "arsenal of democracy" and promoted Lend-Lease programmes of aid to support the British war effort. The US started strategic planning to prepare for a full scale offensive against Germany. At the end of September 1940, the Tripartite Pact formally united Japan, Italy and Germany as the Axis Powers. The Tripartite Pact stipulated that any country, with the exception of the Soviet Union, which attacked any Axis Power would be forced to go to war against all three. The Axis expanded in November 1940 when Hungary, Slovakia and Romania joined. Romania and Hungary would make major contributions to the Axis war against the USSR; in Romania's case partially to recapture territory ceded to the USSR.

Question: Why did Romania join the Axis?
Answer: to recapture territory

Question: How many countries were in the Tripartite pact total?
Answer: 6

Question: How many countries were added after the initial three to the Tripartite pact?
Answer: 3

Question: How many is the number of years between when The British Home Fleet sank the Bismark and when the United States amended the Neutrality Act?
Answer: 2

Question: How many is the number of years between when The British Home Fleet sank the Bismark and when the United States Navy was significanty lincreased?
Answer: 1

Question: How many is the number of years between when The British Home Fleet sank the Bismark and the year a majority of the American public opposed direct military conflict into?
Answer: 0

Question: How many is the number of years between when The British Home Fleet sank the Bismark and when Roosevelt accused Hitler of planning world conquest?
Answer: 1

Question: How many is the number of years between when The British Home Fleet sank the Bismark and when Roosevelt ruled out any negotiations as useless?
Answer: 1

Question: How many is the number of years between when The British Home Fleet sank the Bismark and when Hungary, Slovakia, and Romania joined the Axis Powers?
Answer: 1

Question: What was the United States doing before 1940?
Answer: taking measures to assist China

Question: What did the US trade with Britain in 1940, but before Roosevelt accused Hitler of planning world conquest?
Answer: American destroyers for British bases.

Question: What happened during September 1940, before The British Home Fleet scored a victory in May 1941?
Answer: the Tripartite Pact formally united

Question: What happened when Hungary joined the Axis in November 1950, before May 1941?
Answer: The Axis expanded

Question: When did the first members of the Axis Powers form?
Answer: September 1940

Question: What were the six members of the Axis before 1941?
Answer: Japan, Italy and Germany, Hungary, Slovakia and Romania

Question: How many months after the US amended the Neutrality Act did the Tripartite Pact formally unite Japan, Italy, and Germany as the Axis Powers?
Answer: 10

Question: How many months after the Axis Powers were formally united did Roosevelt call for the US to become an "arsenal of democracy?"
Answer: 3

Question: How many countries were a part of the Axis Powers after November 1940?
Answer: 6