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 the steel industry first emerge in the united states?" whose answer is Pittsburgh.
Each document should contain about 30 words, and these documents should contain useful information.

Query: early steel industry in the united states
Useful Output:

Doc 1: One of the earliest — and ultimately biggest — steel companies in the United States formed when Andrew Carnegie and Charles Schwab created
Doc 2: The use of steel in US manufacturing grew over the course of the twentieth century, current US public policy prevents the steel industry from truly flourishing.
Doc 3: Although it dominated the industry, U.S. Steel was not the only important steel company in the Chicago area during the early twentieth century. Several local
Doc 4: By the year 1920, 60 million tons of American steel were circulating around the world annually, making the United States the biggest global
Doc 5: The company that we now know as U.S. Steel came to be in 1901 when J.P. Morgan financed the merger of Andrew Carnegie's Carnegie Steel Company