stinkyjoe said:
Was there a law against it in the United States at the time? Maybe Joseph Smith wasn't breaking any laws by practicing polygamy?
While Ammon would probably know more about this, my understanding is that when the US became independent from Great Britain, the usage of Common Law was abandoned if favour of a Bill of Rights. Under Common Law, everything is okay unless expressly forbidden. Under a Bill of Rights, freedoms are expressed.
Complicating the matters, there is a huge imbalance in the US between Federal and State law, with the majority of laws with the states. The territory of Deseret was not a state but not fully covered by Federal law. Once a state, they could have had the ability to make it law and for this (and other reasons) Utah was denied statehood.
Plural marriage only became an issue during the time of Brigham Young and continued to escalate. It was only announced to the general membership of the church in 1852. The Federal government passed the Edmunds act and then then Edmunds-Tucker act (both unconstitutional) which sought to curb the freedoms of those who even expressed a belief in plural marriage. The act gave power to the federal government to imprison church leaders and denied members of the church the right to vote and serve on juries and the right to privacy. It gave power to the government to seize assets, including the assets of the church. Four church representatives travelled to Tennessee to change the public perception of the church in 1884. They were brutally murdered whilst study the scriptures before attending church.
Missionaries in other areas beaten, some whipped and in some cases tarred and feathered. Five of the Apostles were arrested and sent to prison, others went into hiding. Not all of those sent to prison had plural wives, merely expressing a belief in the principle was enough for arrest without trial. Missionaries avoided Missouri, where the extermination order gave a Missouri citizen the legal right to kill a Mormon on sight.
In 1890, Wilford Woodruff approached the Lord with a dilemma. On the one hand they had the revelation on plural marriage, on the other the church was meant to obey, honour and sustain the law. Plural marriage had not been illegal in the 1850s but it was illegal now. In response to his pleadings with the Lord, WW received a revelation that the practice of plural marriage was to be stopped. He issued a manifesto in October 1890 and it was approved by the membership of the church. The practice of further plural marriage was prohibited in all places of the Earth where the practice was forbidden by law. The Federal Government in turn allow all previous marriages to remain legal and pardons were issued. Much of the persecution also stopped. Since the assets of the church had been stripped, however, the church was in severe financial difficulties and on the verge of bankruptcy for many years.
Up until that time the dominant form of economy in Utah were the 'United Orders'. These were collectivised systems organised on the ward and stake level. The Bishop administered the storehouse and allocated resources as 'stewardships' to families according to their various abilities. The produce of each was distributed equally according to need. The two most famous orders were Brigham City and Orderville - which was the last to be abandoned. Interaction between the orders in terms of goods and services was organised by the 'Zion's Co-operative Mercantle Institute' or ZCMI. The exchange of money was not the dominant economic system. With the breakup of the orders as part of the confiscation of church assets, the church returned to the principle of Tithing.
In 1915, plural marriage was discontinued for all members of the church, regardless of the legaility of the country in question. Since then it was become an excommunicable offence to engage in a plural marriage.
A small number of LDS separated themselves from the church under various groupings and continue to practice plural marriuage. The largest of these groups (generally referred to as fundamentalist Mromons or FLDS) is located in Colorado City and number about 6,000.
Many LDS in the past held to the belief that plural marriage will one day be re-instated. Church leaders have repeatedly stated that this is not the case: plural marriage will never be brought back in.
Plural marriage (as practiced by LDS) was practiced differently that most people expected. It does appear that although it was revealed during the Nauvoo period, it was first practiced (at least by Joseph) as 'spiritual wifery', in that they were married for eternity only. It was at first revealed only to the leadership of the church.
In order to engage in plural marriage, several criteria had to be met. Firstly, the first wife had to consent to all subsequent marriages. Secondly, separate quarters had to be provided for plural wifes and their children. Thirdly, the husband had to demonstrate the ability to provide for all families equally. In all, about 3% of men in the church engaged in plural marriage when it was available. It in effect acted as a form of social security; often subsequent wives were widows or older women that the first wife took compassion on. Frequently the initiation to take a second wife came from the first wife and not the husband.