In what states is it legal to marry a centaur?

I met my centaur love, Astrid, on a mythical creature dating site. She and I dated for three whole years until I finally proposed to her. Astrid and I were planning on marrying this month, but it recently came to our attention that human-centaur marriages are not allowed in Iowa. This infuriated and depressed us. I don't understand! In Iowa, centaurs are allowed to live among and enjoy the same rights as humans, but for some reason human-centaur marriages are extremely frowned upon. We are willing to travel across the country if it will allow my love and I to elope legally. PLEASE HELP ME.