Children learn languages quickly.<quoted text>
Non-English speaking students should be placed in separate classrooms in programs of total immersion in English, with qualified personnel.
And you're wrong if you think that transient populations do not occur elsewhere.
Note that private schools, public, charter and home school all have advantages and problems.
A good home school program involving professional teachers in a K - 12 can work well. Have seen this.
Publics school in the US/Canada often depend on neighborhood and income.