Finally I smell a flamewar in Stunts Forum!
It is true that most people spoke Hungarian in that southern zone 100 years ago - because Slovak language was not accepted in schools or at work. But if you look at the family names in that area (and even in present-day Hungary), you can see that many of them have Slovak origin, showing that these were Slovak families forced to speak Hungarian.
Btw, southeasthern third of present-day Hungary would be an uninhabited desert if hadn't been resettled by Slovaks in the 18th century. (There were no Hungarians left there after the Turkish invasion.)
'Slovak' people are Czech people who speak Hungarian.
Recent 'Slovakia' consist of: Hungarians, Roma and others (it sounds something like Morocco in Czech). :-)
Southern third of Slovakia was truly Hungarian-speaking and ethnic Hungarian territory not so long ago, that is really a stolen land.