I think the USA should be bigger, and parts of MX look pretty appealing, both from an urban frontier perspective, and from a logistics/resource perspective. If we could nab 300 miles inside the border of MX, we could even deny Cali their coveted illegals.
Basically, drop that MX border, add in some nice 90* angles, and call all of that New Texas. Doesn't make up for what MX has done to us, but definitely shakes things up a bit and gives us an opportunity to eliminate some of the bad hombres Mexico is beholden to.
I think it could be smaller.
Let Puerto Rico go be Puerto Rico.
Get our Troops out of Afghanistan, Iraq, Germany.
Let's Keep Guam, Wake, and a couple other fueling stations/ammo dumps.
Maintain a presence in Antarctica and the NP.
Build a Space Force and let's set up a range on the moon because I understand the BC measures are outstanding for .308.
No territory should be maintained buy the US if they choose to fly their present flag instead of our National Flag.
You don't see people flying their state flags from their rear view mirrors and I don't want to see any American of Irish descent flying an Irish flag from the mirror either.