On Monday, men arrived in a boat at a beach in northeast Mexico and installed some signs signaling land that the U.S. Department of Defense considered restricted.
Mexico’s Foreign Affairs Ministry said late Monday that the country’s navy had removed the signs, which appeared to be on Mexican territory. “The origin of the signs and their placement on national territory were unclear,” the ministry said in a statement.
I’m not talking about the moral aspect, just the strategic.
Obviously invading any nation is generally a bad thing.
Strategically it’s far easier for the US to roll over the border and secure a neighbouring country compared to the logistics of supplying an occupation force abroad.
It’s not like they’re under any real threat of losing, and actors can already launch attacks from inside of the US without sharing a border.
And if your objective is annexation of land, well you generally do need to look at your borders unless you want some weird remote colony/not-colony like Gibraltar.
Look at Russia’s invasion of Ukraine for how well that can go.