There seem to be lots of threads in the general vein of 'why don't Polish girls marry Bolivians?', etc., etc. Setting aside liaisons based on some Third Worlders wanting an American green card or EU access, marriages based on genuine mutual attraction have a better chance of success when both sides have a lot in common. That usually means race, social class, nationality, religion, economic standing (so neither side can be suspected of marrying for money), educational level, values, ideals, goals, interests and overall view of life.
Even when all those factors are in agreement, that is no 100% guarantee of success. Such virtues as perseverance, dedication, sacrifice, patience and mutual forgiveness, which have traditionally held marriages together, are not that widespread anymore, and that is putting it mildly. The self-centered 'I want it all here and now' attitude seems to be becoming increasingly prevalent, and that is a sure-fire recipe for antagonism and disaster.
Even when all those factors are in agreement, that is no 100% guarantee of success. Such virtues as perseverance, dedication, sacrifice, patience and mutual forgiveness, which have traditionally held marriages together, are not that widespread anymore, and that is putting it mildly. The self-centered 'I want it all here and now' attitude seems to be becoming increasingly prevalent, and that is a sure-fire recipe for antagonism and disaster.