I wonder how young Americans men will react to being drafted while young illegal aliens are not? How many young men want to fight overseas while Mexicans are making sweet love to their girlfriends? I remember well how young Mexican men fled south over the border after 911.
That is a depressing point of which I had not thought.
Then we can truly mimic the fall of Rome where near the end the Romans had to depend on foreign mercenaries to fight their battles and diluted Roman citizenship by offering it up to anyone who would fight for them.