Marissa Meyer said this quote

Of course, we know that the world sees this wedding as a historical event. The first recorded marriage union between a Lunar and an Earthen since the second era. And maybe that is important. Maybe the love and compassion these two people have for each other is symbolic of hope for the future. Maybe this wedding signifies the possibility that someday our two races will not only learn to tolerate each other, but to love and appreciate each other as well. Or, maybe…” Kai’s eyes glinted. … this relationship has absolutely nothing to do with politics, and everything to do with our shared human need to find someone who will care for us as much as we care for them. To find a partner who complements us and teaches us. Who makes us stronger. Who makes us want to be our best possible self.