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: "Robert Richardson served as a family physician for Alexander Campbell, who was a Scots-Irish immigrant, who later became what in the United States?" whose answer is an ordained minister.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who was Alexander Campbell in the United States
Useful Output:

Doc 1: A founder of the Christian Church, Alexander Campbell (September 12, 1788 - March 4, 1866) was a preacher, philosopher, author, scholar
Doc 2: Alexander Campbell's influence on the development of the Baptist tradition in the United States is undeniable. Campbell's movement
Doc 3: In summary, Alexander Campbell was both prophet and priest. In the wilderness of American sectarian life, the prophet found the threads of
Doc 4: Campbell is revealed to be an exponent of Christian republicanism, a founder of restorationism and a white supremacist. With such scope, the
Doc 5: With the full approval of his father in America, Alexander. Campbell decided to become a minister in the Seceder Presbyterian Church of Scotland. This decision