There is only one King, Lord Jesus Christ whose Kingdom is not of this world!
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You seem to have forgotten that Joseph Smith declared himself King.
And the second endowment makes people kings and queens also.
William Marks stated that the [LDS] Council of Fifty performed an ordinance in which Joseph suffered himself to be ordained a king, to reign over the house of Israel forever.Some have been uncomfortable with the assertion that Smith became a king. They have claimed that Marks and other critics either confused or misrepresented Smiths reception of the strictly religious ceremony of the second anointing as king and priest.
In fact a later revelation to the Council of Fifty affirmed that God called Smith to be a Prophet, Seer and Revelator to my Church and Kingdom; and to be a King and Ruler over Israel. (The Mormon Hierarchy, Origins of Power, 124)
So?
They succeeded in killing Joseph, but he had finished his work.He was a servant of God, and gave us the Book of Mormon.He said the Bible was right in the main, but, through the translators and others, many precious portions were suppressed, and several other portions were wrongly translated; and now his testimony is in force, for he has sealed it with his blood.As I have frequently told them, no man in this dispensation will enter the courts of heaven, without the approbation of the Prophet Joseph Smith, Jun.Who has made this so?Have I?Have this people?Have the world?No; but the Lord Jehovah has decreed it.If I ever pass into the heavenly courts, it will be by the consent of the Prophet Joseph.If you ever pass through the gates into the Holy City, you will do so upon his certificate that you are worthy to pass.Can you pass without his inspection?No; neither can any person in this dispensation, which is the dispensation of the fulness of times.In this generation, and in all the generations that are to come, everyone will have to undergo the scrutiny of this Prophet.They say that they killed Joseph, and they will yet come with their hats under their arms and bend to him; but what good will it do them, unless they repent?They can come in a certain way and find favor, but will they?
--JOURNAL OF DISCOURSES, vol. 8, p. 224