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: "where did immigrants land in new york before ellis island?" whose answer is Castle Clinton or Fort Clinton.
Each document should contain about 30 words, and these documents should contain useful information.

Query: where did immigrants land in new york before ellis island
Useful Output:

Doc 1: Philadelphia's immigration station opened 19 years before Ellis Island's, yet it wasn't as high-profile as the one in the Big Apple.
Doc 2: It served as the New York immigration processing station between 1855 and 1890. When did Ellis Island open? Ellis Island officially opened as an
Doc 3: New York: Castle Garden, New York's first official immigration station, was established in 1855. The famed Ellis Island would eventually take
Doc 4: In the four decades before Ellis Island opened in 1892, New York State had a robust immigration regime that attempted to ensure new arrivals
Doc 5: However, in the 35 years before Ellis Island was used, Castle Garden, now known as Castle Clinton, was the center for United States immigration.