My point is that there is nothing at all new about federal troops being used to enforce the law.
Without researching it in the least:
Federal troops, or possibly federalized militia, were used to suppress the Whiskey Rebellion during Washington’s presidency.
Federal troops were used in the early 1850s to enforce the return of Anthony Burns from Boston to his master under the Fugitive Slave Act.
Federal troops were used to suppress the fighting in Bloody Kansas in the 1850s.
Federal Marines were used to storm the Harper’s Ferry Arsenal when occupied by John Brown.
Federal troops were used to suppress the NYC draft riots.
Federal troops were used to suppress the KKK under President Grant.
Federal troops were repeatedly used to enforce the law (or to break the strike, depending on your POV) in labor disputes during the late 19th and early 20th centuries.
Federal troops were used to enforce the Supreme Court’s desegregation rulings in the 1950s.
That’s off the top of my head. I’m sure there are a great many more. You may claim troops should not be used this way, but you can’t claim it’s a new thing.
Most of the examples cited were during the Civil War or very near to it when the times were characterized by a pre civil war or post civil war state while this Nation was at war with itself.
I believe that the others were actually National Guard units of the respective states themselves, not regular Army units, although the clearing of the bonus marchers may have been done by regular Army since it was on or near the Capital Grounds and the District of Columbia has no National Guard to speak of.
The President can call out the State(s) National Guard(s).
Deploying and using regular military forces within US soil during peacetime is a whole other turning of the worm.
Funny they won’t use Federal troops to protect the border.