The steel producer is based in Pittsburgh and has operations throughout the U.S. and in the Slovak Republic.
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News about United States Steel
Trump said the U.S. cannot become dependent on steel from foreign countries.
"The people who have pushed for this don't have a clue and they don't know math."
They all at least doubled, and some even quadrupled.
Investors have put fresh bets on steel company shares after Donald Trump's election.