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 go off the silver standard?" whose answer is 1873.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the us go off the silver standard
Useful Output:

Doc 1: The Coinage Act of 1873 removed the United States from the silver standard and created a gold standard by ending the official minting of silver
Doc 2: No silver dollar coins were struck by the Mint and issued into circulation after 1935. The silver dollar drought almost ended in 1964, when new
Doc 3: When the Nationalist government of China went off the silver standard in 1935, it marked a key moment not just in Chinese history but in world
Doc 4: The movement was precipitated by an act of Congress in 1873 that omitted the silver dollar from the list of authorized coins (the “Crime of '73”)
Doc 5: In the United States, the gold standard was abandoned by Richard Nixon in 1971, whereas the silver standard officially came to an end when China and Hong Kong