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The United States has "re-tasked" over 130 US Defense Department spacecraft to monitor the border with Mexico and the border with Canada.
Do you have any idea how big a deal it is to re-task a satellite? Those devices have very limited fuel and no way to refill that fuel. Once the satellites are placed into orbit, they generally remain there, never moved to a differing orbit.
The fact that the U.S. has done this shows the level of commitment the nation now has to intercepting illegal immigrants, and to interdicting illegal drugs. This has NEVER been done before over the issues of immigration or drugs.
As you might imagine, re-tasking those birds for focus on the southern border, also affords the US "keyhole surveillance" capabilities against the Mexican drug cartels. These satellites take imagery, they listen for electronic signals, measure temperature variations through thermography (finding underground labs) and more.
This is the kind of surveillance the US engages in prior to using military force.
From declaring an Emergency at the southern US border with Mexico, and later declaring the Drug Cartels to be "foreign terrorist organizations," deploying a Combat Brigade from the 82nd airborne division to the border as well as logistics from the Tenth Mountain Division from Ft. Drum, NY, launching repeated Rivet Joint Surveillance aircraft and even Predator Drones over Mexico, all the signs are pointing directly at coming US military action inside Mexico.
Incidentally, the military also re-tasked 54 Satellites to monitor . . . the Taiwan Strait.