It is citizenship brainwashing facility. on the Mexican side you can see signs and names of places involving "loyalty," "alliance," etc. The two coasters are identical, one is called True Mexican Heritage and the New American Dream. It is meant to make citizens blend their culture and the American dream into one idea. Once they believe or are brainwashed they can go to other side just to find out they will be a labor force in the fields.
You can check out the entertainers and handymen have funky mexican to american transition names as peeps enter, the staff slowly alter themselves to the american ideal.