You cite ancient history. Polygamy was abolished before UT became a state and is against state and federal law.
Many fundamentalist LDS groups are still following Brigham Young's admonition. They view the current LDS position as proof that the Utah Mormons have denied the faith since the LDS Church excommunicates any member who marries more than one wife at a time. This is not to say that plural marriage is a dead issue in the Utah Church.
It appears that the monogamous relationship currently stressed by the LDS Church is but a brief interlude before polygamy commences again. As Bruce McConkie wrote on page 578 of Mormon Doctrine, "Obviously the holy practice will commence again after the Second Coming of the Son of Man and the ushering in of the millennium."
I hope you guys are ready to welcome "sister wives," the day is coming.