Illegal Immigration vs Legal Immigration

Before 1914 The US had completely open boarders.

We did not exclude any immigrants regardless of where they came from, their race, ideology, religion, skill set, etc.

We said come if you want and we are happy to have you.
After 1914 we closed our borders and started an immigration policy.

Today why can't we have the same policies as we had before?

Because...
(I added this line since no one seems to read I answer my own question in the following statements)

We have over the course of the last 100 years instituted Government policies that Guaranteed certain rights to all who come here.

We have instituted services that are paid by the general populace through taxes and have made laws that give fundamental rights and services.

For example. Any person who goes to an emergency room is required by law to receive medical care and can not be denied whether you can pay for those services or not.

We have made policies that require by law schools to admit you whether you are a citizen or not.

We have literally made 1000s of such laws and those are just two examples.

Now because of these same laws it has become important to make sure that the ONLY immigrants who now come to the country provide a better benefit to the society as a whole than what they take from the society.

Before the 1960s the best benefit to the country was probably illegal immigrants vs legal immigrants because we did not have many of the laws on the books and did not provide more monies to care for immigrants than what they produced.

Now because of what we require as basic services(social compact) i.e. "rights" by government laws it is detrimental to have practically any immigration whether legal or illegal.