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 was decoration day changed to memorial day?" whose answer is 1967.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was decoration day changed to memorial day
Useful Output:

Doc 1: Memorial Day was originally called Decoration Day. It originated during  changed from Decoration Day to Memorial Day. Since 1971 Memorial Day has
Doc 2: An act of Congress changed Memorial Day from every May 30th to the last Monday in May in 1971. Dennis said the creation of the three-day weekend
Doc 3: Originally called Decoration Day, the occasion was first marked three years after the end of the Civil War.
Doc 4: Originally known as Decoration Day, Memorial Day started in the years following the Civil War and became an official federal holiday in 1971
Doc 5: Congress recognized Decoration Day as a federal holiday in 1938. People began to refer to the holiday as Memorial Day following World War