“Make it in Michigan, make it in America, invest in our communities and our workers in places like Warren. That's what this is about,” he said.
After his speech, Biden made a quick stop at a Black-owned clothing store in Detroit before sitting in the backyard of a house with four steelworkers to discuss economic and labour issues.
“It just drives me crazy that the country is going to hell in a handbasket economically and politically and in terms of our health, and we’re doing nothing about it,” Biden said.
The former vice-president is trying to convince voters that he would be the best choice to revive the coronavirus-hobbled US economy.
Though Biden has led Trump in virtually every national poll for months, that issue has been a sticking point, and a Reuters/Ipsos poll on Wednesday showed the two candidates were dead even on the economy at 45% each.
The poll showed Biden with an overall lead of 12 percentage points among likely voters.
Factory jobs grew in number after Trump took office, but the gains were wiped out during the pandemic.