Looking of for my g,g,grandfathers birth or death record his name was possibly Louis Sinev. I found his wife Julianna Sinev b.1885(Terek or Torok maiden name), coming to New York in 1920 listed as a widowed. Her hometown was listed as Novi Sad, Jugoslavia.
my grandfather was 16 at the time he came to the US with his mother and sister.

Also in what country could I petition for citizenship? Hungry or Serbia?

Thanks Many Times.