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: "In between The Postal Service and Chagall Guevara which one was formed in 1989?" whose answer is Chagall Guevara.
Each document should contain about 30 words, and these documents should contain useful information.

Query: formation year The Postal Service
Useful Output:

Doc 1: In 1737, by age 31, Franklin had already built a prosperous business as a printer, shopkeeper and publisher of a newspaper, The Pennsylvania
Doc 2: The Post Office dates way back to 1660 when it was established by Charles II. Under the guise of the General Post Office (GPO), it soon grew as an important
Doc 3: On February 20, 1792, President George Washington officially created the modern United States Postal Service by signing a sweeping act that
Doc 4: Letter carriers began to unionize in the 1860s, almost as soon as home delivery began, and fought for better pay and work conditions. But even a
Doc 5: As a retired postal worker i found this documentary very interesting. the postal service is still a vital form of communication for this country.