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 united states go on the gold standard?" whose answer is 1873.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did the united states go on the gold standard
Useful Output:

Doc 1: Richard Nixon's decision to delink the dollar from gold, announced without warning in August 1971, remade the global monetary system in an instant.
Doc 2: When Alexander Hamilton set up the U.S. currency system in 1792, he had Congress use both silver and gold coins to set the value of the dollar.
Doc 3: By the 1960s, a surplus of U.S. dollars caused by foreign aid, military spending, and foreign investment threatened this system, as the United States did not
Doc 4: In 1933, when the United States went off the full domestic gold standard  Between 1879 and 1933, when the United States was on a full gold
Doc 5: This international system of commodity-based money reached its zenith under the so-called classical gold standard, which characterized the