Across the globe, there are numerous ethnic backgrounds represented, but we are all of one race: human.
Bi-ethnic marriages are not as much of a "bold step" in some developed western countries such as America, where a wide variety of ethnic peoples coexist. I can see how and why these types of relationships are seen as taboo in less developed countries, where the vast majority of people are of the same ethnicity.
Despite some people truly having deep-set prejudices against people of particular skin colors, I believe the potential for marriage problems in these situations come from a difference in
culture, not "race". It is quite possible for two white people to come from completely opposing cultures and have nothing in common, and therefore have a more difficult experience if they were to marry.
Marriage is hard regardless of whom you marry, but it's true that people from
extremely different cultures may face more challenges along the way, especially if they do not have an open mind and a selfless heart. That said, if both people have a right attitude, desire to learn and embrace the culture of their spouse, and have the support of their loved ones, a bi-ethnic marriage can actually be quite a beautiful thing.
My parents are from two completely different worlds. They have had many struggles when it comes to cultural differences, but they have also had many triumphs that are unique to multi-cultural marriages. I myself am Filipino-American, and I'm dating a young man who was born and raised in Asia, and we have already encountered some challenges (as well as some exciting and fun blessings!) that would probably not exist if he and his family were born in America.
I think it all depends on the hearts and attitudes of the individuals.