The overwhelming majority of the US’s wars were not declared.
The music on that is irritating, but it’s worth watching. Jump to 1:30 to skip the intro, jump to 7:50 for just the most important bit.
Both the Korean and Vietnam wars were “police actions”. If Trump wants to attack somewhere, he’ll attack somewhere.
I agree that Trump is powerless with a fully opposed Congress. But see my posts upthread on the obstacles facing that task.
If you have a plan to overcome the corruption of electoral administration (as currently expressed via voter suppression, gerrymandering, racially targeted voter roll purges, etc, and rapidly escalating), that is a wonderful thing and I’ll cheer you on every step of the way.
But you do need to have a plan.