Ice is a modern invention that probably should not exist.
There were no immigration regulations until around 1880 when they illegally decided to deport all the Chinese railway workers who made the Transcontinental Railway for us.
There is no legal basis for immigration laws since clearly it is contradictory for the descendants of European immigrants, to start calling other illegal immigrants.
Its a question of law, ethics, and equality.
If we can claim its ok to prevent immigration, then the Native Americans have the same right to kick us all out too.