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: "what river is the western border of the state illinois?" whose answer is the Mississippi River.
Each document should contain about 30 words, and these documents should contain useful information.

Query: western border of the state of Illinois
Useful Output:

Doc 1: The Wisconsin-Illinois boundary should be a straight line. But it is not a straight line. It has many small bends in it, and it weaves in and out of alignment.
Doc 2: The original Northwest Territory ordinance called for Wisconsin's eventual western border to be the Mississippi River, with a line running north
Doc 3: - Map of Missouri, Tennessee, and parts of Nebraska, Kansas, Indian Territory, Arkansas, Illinois, Indiana, Ohio, Kentucky, Virginia, North Carolina, and South
Doc 4: Illinois is bordered by the state of Indiana in the east; by Kentucky in the southeast; by Missouri in the west; by Iowa in the northwest and by
Doc 5: The river that forms the western boundary of Illinois is the Mississippi River. · The river that forms the southern boundary of Illinois is the