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Roman conquerors gave full citizenship because they shared a language in common.
The Latin communities were immersed in Roman culture, as part of their land was given to the Romans. The conquered people received only half of their citizenship because, despite being part of the Italian peninsula, they had little in common with the Romans.
Because the other half had to stay home to help their parents during this hardship. Other reasons are that the parents could afford their children going to school, during the war.
Immigration should not be restricted, Americans today have struggled to understand the concept of accepting everyone, people need to really let go, granted, over time many people have grown to accept other races, but it will never be something that everyone accepts.