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 gates of the arctic become a national park?" whose answer is 1980.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did gates of the arctic officially become a national park in 1980
Useful Output:

Doc 1: Gates of the Arctic National Park and Preserve was established on December 2, 1980, under the Alaska National Interest Lands Conservation Act (
Doc 2: The park was established on December 1, 1978, as a National Monument before President Jimmy Carter upgraded it to a National Park as part of the
Doc 3: President Jimmy Carter signs the Alaska National Interest Lands Conservation Act on Dec. 2, 1980. Photo courtesy of the Jimmy Carter
Doc 4: Around the time the park was established in 1980, most visitors viewed its glaciers from the vantage point of the water, where tidewater
Doc 5: When Did It Become A National Park? First protected as  parks then be forewarned that Gates of the Arctic has no official hiking trails.