The best answer here is rolling admission. Rolling admission means that you can apply whenever you'd like and you'll find out if you are admitted once your application is received and reviewed.
For late admission and regular admission, colleges will require a due date to ensure they are able to sort through all of the applications they receive before the deadline. Open admission deals with the requirements that a college requires for a student to attend.
During wars Americans have tried to exclude immigrants of the country's they were fighting against. For example German Americans were discriminated against in wwll despite living in America their whole lifes and never setting foot in Germany. I think that now people are not inclusive also because of how strict our immigration laws are.