Why might bringing outsiders into the Roman army be an issue?

Bringing outsiders into the Romans army can be an issue for several reasons.

Explanation:

It might turn out to be a problem to bring outsiders in the Roman army. The military leader of the Roman Empire was the most powerful with the discipline and harmony in armies. The Romans were strong and violent to their enemies as they conquer territories. If an outsider joins the army, he might consider being different because of origins and culture that kept them bound to their traditions. Also, there might be a chance for them to be traitors as it was common in that period.

the constitution of the united states gave congress the absolute authority over immigration laws

i think it would be reparing roads