you and i know that that is what the dominican fence would look like.
besides, the dr is located on an island, so what are you going to do? sorround the whole country with a fence?
as evidenced by dominicans constantly complaining about haiti.
haiti poses a threat to dominican security
other governments don't care, because haiti is no security risk for them.
putting into your constitution that children of illegal immigrants will not be dominicans is not a regulation of illegal migration, it's only prolonging the problem. these children will have no secure status, therefore they will not get an education, and hence they will resort to begging, working in the informal economy and crime.
when you realize that the costs for maintaining that fence are too high, and shutting down your borders didn't work, you can try and find another solution, independent from foreign pressures.
investing money n it is a good start, which you would be able to do, because you no longer have to spend half your budget on dept payments.