There is widespread thought that Serbian women like to marry non-Serbs.
Maybe it is easier for American, for example, to find woman for marriage in Serbia than in USA, according to his social strata, but really strong relations and further strong family could appear only if there is real love and great sympathy for each other.
Sympathy is also not enough, as there should be also respect present.
According to the fact that Serbian men do not show much respect to their ladies and in most cases are rude and even vulgar, having this pseudo-macho behavior, foreigner with gentle manners, good care of woman and, maybe, better financial status and the one who could give better perspectives for future life, of course, has much chances to be liked by Serbian women, get their attention and finally choose his Serbian princess to get married later.
The key is you do not have to expect it should be easy.