This is simple.
As wave after wave of criminals have reached over our boarder, and have perpetrated crimes within America and against Americans, even to the point of influencing American elections especially across border states(destabilizing the US), and Mexicans have had to deal with the horrific and destabilizing human atrocity of over 100,000-120,000 dead due to these criminals running northern Mexico and Mexico in general, the humane and economic thing to do here would be to annex the northern states of Mexico (including Baja), quickly capture and execute all criminal killers and thugs involved in murder and human trafficking, while creating a guarded, orderly, and free (US and non-voting) territorial trade zone.
There, now all of our plants across northern Mexico are back, and we won’t have to tax them, and our border wall could be much shorter!
Arizona could then become a new gateway port of trade to the US while California continues to sink into the abyss politically, morally, and economically...
Hey, I obviously didn’t proof read anything, but the point still gets across.