Government can't rebuild anything actually at least in a free market capitalist economy with government limited by a Constitution that gives most of the power to the people. But what he was doing and would still be doing now if re-elected is get government out of the way and make it economically attractive and possible to make steel and lots and lots of other things in New Mexico again.
But you're right. The USA gets more than 90% of its steel from
- Canada (24.2%)
- Brazil (17.5%)
- Mexico (14.3%)
- China (26.9% of U.S. imported items made from iron/steel)
- Taiwan (8.6%)
And it is obvious how dependent we are on China for so many things critical to our lives and livelihoods. Trump policy is to put the power back with the USA. Biden and Kamala pretty much even talk about that never. We desperately need to get Trump back in the White House where he can't get it all done in four years but he can sure get the ball rolling in the right direction. Then if we have the good sense to elect his successor who supports those policies for another eight years we can pretty much turn things around.