"How do you dare tell me that I'm my Father's son
when that was just an accident of Birth." (From
the Jethro Tull song "Wind Up" from the AQUALUNG
album.

What I don't understand is that you limit the discussion
to immigration. There are many other accidents of birth,
such as being born to poor parents. By the same token,
such a person would have the right to take money (from
where is not clear) at least until he possesses the average
amount of money of people in the world.

Again, being poor is quite often not one's own fault, but
I doubt you would argue that that is carte blanche for robbing
a bank.

It SHOULD be a goal of society to provide equal CHANCES for
everyone. Not only between nations, but within nations. Do
that and the immigration problem takes care of itself (most,
though not all, immigrants, at least these days, immigrate
to improve their financial situation).

By the way, my wife and I are both immigrants. I immigrated
from America to northern Europe to improve my quality of life
(not necessarily financially) and my wife immigrated in order
to live with me.