We don't even need to go that far. When I was young I remember there used to be a government TV ad that ran starting every Christmas season to remind non-citizens that they have to re-register at the Post Office by January 31st every year. Documentation is the key to control and we no longer have any control at all over foreigners after they get past the border.
I remember seeing notices in the Post Office that aliens (what were they?) must report in. This was how organized we used to be about legal immigrants. Circa 1965.
BTW Obama’s father had to leave his Harvard studies prematurely. Harvard forced him out of the USA because he was making it with the white girls (students) too much and socializing with them too much.
IOW he was here on a visa and got booted out by the INS
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Harvard had asked the Immigration and Naturalization Service to delay a request by Barack Hussein Obama Sr. to extend his stay in the U.S., “until they decided what action they could take in order to get rid of him,” immigration official M.F. McKeon wrote in a June 1964 memo.
http://www.politico.com/story/2011/04/obamas-father-forced-out-at-harvard-053968