You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did the us and uk become allies?" whose answer is 1940.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the us and uk become allies
Useful Output:

Doc 1: Even though the Second World War officially broke out in 1939, the United States did not join the conflict until 1941. · Despite not being officially involved in
Doc 2: The United States has no closer Ally than the United Kingdom. Following the end of the American Revolution in 1783, the United Kingdom
Doc 3: Eventually, in 1917, the American's joined the war on the side of Britain and France. The arrival of money, ammunition, and millions of soldiers helped tilt the
Doc 4: According to Wikipedia, it occurred between 1895 and 1915, as various disputes between the two nations were set aside (the Union had not
Doc 5: When Germany's invasion of Poland in 1939 touched off World War II, Roosevelt called Congress into special session to revise the Neutrality Act to allow