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 the maple leaf first adopted as a symbol in canada?" whose answer is 1868.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when was the maple leaf first adopted as a symbol in canada
Useful Output:

Doc 1: Since the early years of the 19th century, the maple leaf had been recognized as a Canadian emblem by anglophones and francophones alike. It
Doc 2: Maple was such an important product that the maple leaf was seen as Canada's symbol as early as 1700 (Library and Archives Canada). Eventually,
Doc 3: The maple leaf was chosen to adorn the flag as it has long been used as a symbol of Canada. It became popular in the 19th century, and was used
Doc 4: Around the 19th century, the maple leaf became synonymous with the Canadian identity and could be found everywhere in mainstream culture,
Doc 5: February 15, 1965, Canada flew the maple leaf for the very first time. Historian Allan Levine explains the rocky road to our national symbol.