better yet, just send in kill teams, and take out the Zetas and their Cartel pals.
No US boots on ground long term. Do as much of the work as possible with air assets.
Then control the mexican border as seriously as the USSR did theirs.
Recall, The Democratic Republic of Germany shot folks trying to LEAVE. How many American citizens do you think the Border Patrol will have to shoot as they cross from the US into Mexico, before Americans decide to stay in the US?
