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 july 4 become a federal holiday?" whose answer is 1938.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did july 4 become a federal holiday
Useful Output:

Doc 1: The Declaration of Independence was adopted on July 4, 1776. Most of the delegates to the Second Continental Congress signed the document on August 2, 1776.
Doc 2: On July 4, 1776, the Continental Congress formally endorsed the Declaration of Independence. Celebrations began within days: parades and
Doc 3: While it's only been a paid federal holiday since 1938, the Fourth of July has been celebrated by Americans stretching back to that first momentous day in 1776—
Doc 4: Q. When did Independence Day become a national holiday? A. The Fourth of July was not declared a federal holiday until 1938! Q. Is anything
Doc 5: The day was later signed into law on June 28, 1870, making it one of the oldest federal holidays. But why do we celebrate July 4 specifically,