The doctrinally correct answer to this question can be found in the holy scriptures, but there must be an open mind that is willing to accept and understand that these points are true. First of all, the church didnt just simply abandon "polygamy" because of the supreme pressures of the United States Government. The Saints had already been kicked out and persecuted all over the country, and there was very little that anyone could do to them while they lived nestled in the Wasatch Mountains. In reality, many feared to even go into the Salt Lake valley because of the power the people had there. They had taken a barren wasteland and turned it into a large farming community with new buildings and the base of a giant new temple being built in the center of the city. The real reason that the Saints stopped "polygamy" is because it was no longer a necessary commandment of God for them.
Now I know Im probably being laughed at right now, and people are like well anyone can say that it was a commandment of God to stop or start such an act, but I would like to give evidence of this very truth using universal scriptures. In the three major faiths, and their branches, speaking mainly of the Jews, Muslims, and Christians, all believe in some way orform that the Old Testiment is a inspired book and the direct word of God and his dealings with the people of ancient Israel and their predecessors. Latter Day Saints, who are also Christians, believe the Bible to be the Word of God as well (Article of Faith #8). Now, I laugh, at the narrow-mindedness of people that are so quick to judge the Church of Jesus Christ of Latter Day Saints for the practice of "Polygamy" when the Ancient Patriarchs, mainly Abraham, Issac, and Jacob, along with King David and Solomon and Rehoboam, and others in the Ancient Scriptures, were commanded to do the same thing. If you notice, Gods works in patterns. He has always called prophets to help teach his children, he has always given divine inspiration, and he always has loved his children. No matter how many times and how many ways the laws of man change here on the earth, since the creation, the laws of God have stayed the exact same. Men, ignorant and unwise, see fit to change those holy laws that are designed by the eternal creator, manipulate those laws, and make them conform to him as so he doesnt have to be a sinner or offender of the law of God, or at least in his eyes he sees himself as not. Did God command the three ancient patriarchs to take multiple wives? Yes. Do you frown at them when you read about what they did? Nope. Because God "commanded" it. Do you frown at David, or Solomon, or Rehoboam? Nope. Because God "Commanded" it. Read the account of David and Solomon. God was fine with them having multiple wives, until they over used that power, and in davids case, killed a man just to have another wife. So if God called the Ancient Patriarchs to do it, then over 1000 years later, called 3 new men to do it. Are people narrow minded enough to not realize that God has laws that he asks men to follow to try their faith. For the Latter Day Saints to keep practicing "Polygamy", even after all the persecution and near death experiences, that to me shows an immense amount of faith. It makes me feel bad for all those people that fight against the church, their faith and understanding in God, his Commandments, and the Holy Scriptures, must be simply next to nil. I ope and pray that people can see that Gods law is his law, a