text: People emmigrate from the US all the time.  I don't understand your question here.  Are you already illegally in the US and so you wonder if you could leave, say on an airplane or ship to another country, whether US immigration would stop you?  If so, I don't think so.  You would have to make it through the customs of the country you were going to, though, and if you did not have legal documentation to show for your being in the US, they may not let you into their country.  Could try it - also depends on which country you are planning on going to.  However, if you are not presently legally in the US, you won't be able to return legally and would eventually be deported from the country you are in back to your own home country and not to the US.