Mormons still practise polygamy sort of. They have “sealings” which is marriage forever, not just “'til death do us part”. If a widow is to remarry, she needs to break the sealing to her dead spouse if she wishes to be sealed to get new one (or she could stay sealed to her first spouse and only marry the second until death).
A widower, however, doesn’t need to break the previous sealing. He can be sealed to multiple women no problem. Essentially polygamy, but only in the afterlife.
Can confirm. If any Mormons are reading this and think it’s made up-- ASK YOUR BISHOP what happens if you were to die or have a civil divorce and you or your spouse wants to remarry in the temple.
They don’t teach this openly, and your bishop may beat around the bush but this is all true.