Get a book on German history 1930-45.

To answer your question:

https://www.bbc.com/news/articles/c9qwez9zz7jo

The Insurrection Act of 1807 allows the president to use active-duty military personnel to perform law-enforcement duties inside the US.

Once invoked, troops could be tasked with a range of duties, from quelling civil unrest and enforcing court orders to arresting and detaining migrants.

Because the Insurrection Act was written in broad terms, with little specific guidance on how and when the powers can be used, it gives presidents wide latitude in deciding when to mobilise military personnel for domestic operations.

Time to bring in the army to oppress the citizenry. Hoo rah!

Deportation of “homegrowns”. He’s not exactly subtle about it. Watch out for talk about violent criminals being too dangerous to be allowed to stay in America.

Not sure what the next one is, but the last one will be the “War on internal terror” aka IWOT. After that it’s over

You ignored something as bluntly unlawful as orwelian Patrioct Act becouse it was happening to “them”. The ammended one will happen to you.

A return of the concept of “unamerican” art and activities, to support the destruction and suppression of said things.

I’d normally say book burnings first, but those have been an on-off thing in some parts of the states since the 50s.

So I’ll go with “officially endorsed” book burnings. Not officially organised, mind, but an actual expression of support shown.

Making HRT straight up illegal

Sending dissidents, queer people, immigrants, and political rivals on a one way trip to El Salvador

Lining up military forces along the Canadian and Mexican borders, then a moment of dementia when Trump says he’ll do the same to Greenland

AI meets eugenics meets racism

At this rate, probably a tax and tariff on the right to breathe air.