Conversation so far:
Where did William McKinley grow up?
McKinley grew up in Poland, Ohio.
Did William McKinley have any siblings?
William McKinley Jr. was born in 1843 in Niles, Ohio, the seventh of nine children
What school did William McKinley attend?
Graduating from Poland Seminary in 1859, he enrolled the following year at Allegheny College in Meadville, Pennsylvania.
Did William McKinley graduate college?
He remained at Allegheny for only one year, returning home in 1860 after becoming ill and depressed.

Question: what led him to politics
Self-contained rewrite: What led William McKinley to politics?