re: Mormons Taking Over Central Florida

Mormons are unbelievably great people, there is no denying that.

My question is, if their founder, Joseph Smith, and Brigham Young both practiced polygamy openly and endorsed it how did the church ban the practice? I mean if they think it's wrong how they can be so devout in following a person who participated in it?
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The plural marriage concept didn't really take off under Joeseph Smith. After Smith's murder and the Mormon exodus to Utah, Brigham Young really got polygamy within the LDS church cranked up.

The LDS "Prophet" dictates what church members will, or will not, do. He's the direct voice of God on earth, so whatever the Prophet says, pretty much goes.
When the (primarily LDS) residents of the Utah Territory wanted statehood, they were faced with a problem. Congress didn't approve of polygamy and was unlikely to be dissuaded of their viewpoint. So, very conveniently, the Prophet got the word from God that polygamy was no longer approved. Lo and behold, shortly thereafter...
Utah was granted statehood.
For many years, "dark people" were not allowed to be members of the LDS church. But, about 35 or 40 years ago, after realizing that most every white person who was going to join had already joined, the Prophet got word from the Almighty that blacks could be members.
It must be good to be the Prophet!