Conversation so far:
what happened to andrew carnegie in 1901?
Carnegie invested $40,000 in Story Farm on Oil Creek in Venango County, Pennsylvania.
In one year, the farm yielded over $1,000,000 in cash dividends.
what else happened in a year?
Carnegie worked with others in establishing a steel rolling mill, and steel production and control of industry became the source of his fortune.
was this a success?
I propose to take an income no greater than $50,000 per annum! Beyond this I need ever earn, make no effort to increase my fortune.

Question: what else before?
Self-contained rewrite: In addition to making a fortune with successful investments in a farm and steel mills, what else did Andrew Carnegie do?