The New United States would be a global hegemon, keeping too cool for school/skid row/Shithead Trudeau (TCFSSRST) world under our thumb at all times.
The only major loss would be the huge naval port in San Diego and a nuke sub base in Oregon. All other bases/forts/camps l in TCFSSRST could easily be replaced. New United States would have hundreds of active nuclear missile silos, copious ground forces, almost the whole of fixed wing and rotary assets, virtually all the armor, at least two major nuke sub bases along with Norfolk NSY. All the Skunk Works operations could be moved to Nellis/Area 51. The vast majority of defense production would lie with New United States. Almost all missile/rocket development and production would stay with New United States slightly offset with the loss of the launch facility at Vandenberg. Command-control-oversight assets would like almost exclusive with New United States. All airborne capabilities would remain with New United States. Amphibious capabilities would be about even.
The migration of copious R&D technology development from Silicon valley to other points in New United States renders that area of TCFSSRST a non factor.
The financial/economic epicenter and its subsidiaries (Atlanta, Charlotte, Chicago, Dallas, Houston and others) would remain almost exclusively with New United States.
The loss of the California coast ports would be troublesome, but there is substantial ocean access on the Gulf and the Atlantic.
With some noted exceptions almost the whole as well as untapped natural resources would remain with New United States. Some areas of Ag Production would certainly require some sort of trade agreement with TCFSSRST. If the dominate political thought relative to the usage of natural resources for Ag production get their way in TCFSSRST then that could be a real problem. Admittedly TCFSSRST could have copious grain production capabilities in the North, but that faces greater peril with colder temps. Colder temps are the bane of modern grain production whereas dry and arid conditions can be overcome with science. Otherwise NUS maintains a massive fruited plain for grain production, as well as copious and cheaper livestock production capabilities. NUS states Texas/Florida and in general the Sun Belt offer substantial opportunity to further develop Citrus and Vegetable production.
Geographically NUS has massive lands available to solidify diversification of energy production, Outside of the Southern part of TCFSSRST, NUS would dominate in solar and probably breakeven with wind. Given the political headwinds for nuclear in TCFSSRST, NUS could if it choose to do so outproduce TCFSSRST substantially in that area. Oil could be a breakeven situation depending on how known and available reserves in each country are developed. The political nod for fossil fuels would most certainly favor NUS. TCFSSRST could have an advantage in certain rare earth minerals area, as well as in certain precious metals/diamond (mainly for industrial use) production. Overall that factor is TBD.
TCFSSRST would almost certainly be best served by being best buds with NUS.