Up to 1918 it was http://users.erols.com/mwhite28/austhung.htmhttp://users.erols.com/mwhite28/austhung.htm where 12 different languages were spoken. After the fall of A-H several new countries were formed and one was Czechoslovakia, which in 1993 separated into Czech Republic and Slovak Republic.
Do you know language spoken by your ancestor?
You need to find an US document on your first ancestor to provide you with a precise place of birth in the A-H empire so you can proceed with the research.
www.iabsi.com/gen/public www.helenezx.homestead.com[look of your ancestral surname in Slovak Pride Index].