Thomas S. Monson is the prophet.
He wasn't Mormon, let alone a "Mormon leader." He was a power-hungry creep who disliked Mormons, and made up his own church -- of which he made himself a leader. Calling Ervil LeBaron a "Mormon leader" is like calling Hitler a "Jewish leader" because he disliked Jews and became chancellor of Germany. Huh?
brigham young was the leader of the Mormon church in 1847
your face what else
Joseph Smith.
The Church of Jesus Christ of Latter-day Saints (commonly called the "Mormon" Church) was not organized until 1830, so it didn't have a leader in 1800.
Because the Mormon Pioneers traveled on it.
John Taylor was the third president of the Church of Jesus Christ of Latter-day Saints (the "Mormon" church), but his middle name was not Joseph. He converted to Mormonism six years after it began, so he wasn't one of the original leaders, but he was an early leader. I couldn't find any record of a John Joseph Taylor being an early leader in the Mormon Church.
Brigham Young.
The Mormon Trail got it's name because it was used by tens of thousands of Mormon pioneers travelling west to find religious freedom.
The official name of the "Mormon" Church is The Church of Jesus Christ of Latter Day Saints. It was not established by "mormon's", but by one man, Joseph Smith.
I believe that it was Utah.
Joseph SmithJoseph Smith, Jr., the leader of the Church of Jesus Christ of Latter-day Saints (the "Mormon' church) was killed by an anti-Mormon mob in June 1844. His brother Hyrum was also killed on the same day. Other Church members were also killed by mob violence in that year.