False. No such permission is given. (http://mises.org/daily/5343/Consent-of-the-Governedu) Furthermore, the idea that anyone has the authority to order someone off of land he does not personally own or whose owner's interests he does not personally represent is ludicrous. It is the kind of delusion to which one is susceptible through participation in the collectivist mystical tribalism fostered by government.

The lesser of two evils is still evil.

Let's set asside the people who immigrate to the United States simply because there may be relatively more opportunities for economic advancement here than in their home countries. Let's focus on those people that you yourself have specifically brought into this discussion: those people who face Real, Genuine Oppression. I look around me an I see the sick, lying collectivist bullshit which is choking our civilization to death and which, in the meantime, is also vastly responsible for perpetrating and perpetuating this so called Real, Genuine Oppression, around the world and I realize that it uses money confiscated from me to do it, that it relies on my blind trust and obedience to a government created and sustained by liars and con-artists. YES. Evil. Don't you throw that cheap argument-stopping smear word "glibertarianism" at me, as if I am the one who does not understand evil, usekh. As far as I am concerned, it is the collectivists both Left and Right, who do not understand the evil that their system pepetrates both domestically and abroad, many, because they have been bribed with their own money and think that they owe their "middle class" lifestyle to an enlightened elite who act only for their benefit.

you've just described hitler's germany to a tee.

"Society in every state is a blessing, but government, even in its best state, is but a necessary evil; in its worst state, an intolerable one."
— Thomas Paine (http://mises.org/daily/2897)

You are conflating the Social Sphere with the Political Sphere. This is a false dichotomy. Read Franz Oppenheimer. (http://en.wikipedia.org/wiki/Franz_Oppenheimer)

An abstract entity, a collection of identifiable phenomena does exist, which can be identified as being part of the concept "society," but the belief that society is the plaything of "leaders" who can "socially engineer" it into shapes pleasing to everyone's sense of values, or even a lasting majority's "sense of values" is delusional. Society exists, but it is not one monolithic thing, like Hobbes's Leviathan. (http://en.wikipedia.org/wiki/Leviathan_(book)) Hobbes's Leviathan is an invented secular god, a bit of sociological idolatry grounded in collectivist fantasy. It is the kind of "entity" to which is alluded in all sorts of places, such as the lyrics of the song by Primitive Radio Gods: "Standing Outside a Broken Phone Booth With Money in My Hand":

We sit outside and argue all night long,
About a god we've never seen,
But never fails to side with me.

Everybody thinks they know exactly what "The Social Contract" means, and we attempt to enforce its terms upon each other based upon that hubris. It isn't true, except in very very limited and carefully delimited cases, that "our" will is "united" by "common purpose". We delude ourselves with the attempt to control the Social Sphere through collective violence in the Political Sphere. The attempt produces perverse, unintended consequences and empowers the unscrupulous. It shrinks the Social Sphere of cooperation and enlarges the Political Sphere of conflict. This is because power, unlike wealth and economic production, is a zero-sum game. For A to have more power, some other human being(s) must have less.
What is actually the case when we often speak of the Social Contract, is that even among those who believe in it religiously as a real explicit understanding, no two people can agree upon what that explicit understanding actually is, in its details, and a contract whose terms are such that no two parties can explicitly agree to them is no contract at all, whatever else we may say about or think of the feelings of mutual amity which bind groups of human beings together into cooperative efforts to divide labor and trade.