To quote President Wilford Woodruff:
"Inasmuch as laws have been enacted by Congress forbidding plural marriages, which laws have been pronounced constitutional by the court of last resort, I hereby declare my intention to submit to those laws, and to use my influence with the members of the Church over which I preside to have them do likewise."
Wilford Woodruff, President of the Church, Official Declaration 1
What else have they abolished?