To his everlasting credit, Donald Trump won over more union voters, more blacks, Hispanics and Asian Americans than any Republican in recent memory.
He even won the endorsement of some unions, especially in law enforcement, but also, for example, some engineers & boilermakers, iirc.
Other unions (especially government workers) are not just married to the Democrats but have, in effect, become appendages of the Democrat party, not sure if there's ever going to be hope for them...
Yes, Trump reached deep into opposition territory to snag a lot of their voters, and this is a good thing. I'm just pointing out the Union labor mindset that existed in the same parts of the country in 1860 as it does today. Pretty much every state surrounding the great lakes is a haven for Unions, and they were just as concerned about "scab" labor in the 1850s as they are today.
What i'm pointing out is that the social demographic divide has lasted through the last 170 years. It's still pretty much the same ideas, the same people in the same areas of the country.