Migration between countries and within countries

There is currently a major migration crisis in Europe, because there are so many people from Africa and the Middle East who want to come into the EU. The USA have a similar problem with large numbers of people from Mexico trying to cross the border into USA. The consensus is that the problem will be solved by tightening up the border controls. However, I think that the problems might eventually be solved better by allowing free migration to all.

I know this might seem counter intuitive but I think that this lesson comes from a smaller scale migration crisis which we have within Ireland. Basically too many people want to move from relatively poorer areas in the west of Ireland to the greater Dublin area in the East where jobs prospects are better. Everyone agrees that the scale of the migration is unsustainable and it has led to unsustainable growth in rent pries which makes it difficult for people on a normal wage to afford to live.

The big difference with this local migration crisis and the larger one is that there is no international border involved. Hence, nobody is proposing to introduce border controls at the M50 junctions. Instead politicians seek out much more positive steps to solve the crisis e.g. giving companies special grants and/or tax breaks to relocate to an economically disadvantaged part of the country.

It is no longer considered OK to discriminate against people based upon their race or gender, but for some strange reason, it is generally accepted that it is still OK to discriminate against people based upon where  they happened to be born. I know that I am very lucky because I was born in USA to parents who were in turn born in Ireland. This means that I am free to live almost anywhere I like in Europe or North America. But, wht are people who happened to be born in Mexico or Syria denied that right?

Perhaps the same solution could work on a global scale or maybe I am just dreaming?