The Mormon exodus west was impacted by both people within the Church and people outside it.
The first move west, from Palmyra, New York to Kirtland, Ohio, came about because a large number of people had converted in the area of Kirtland and the Church decided to move the headquarters to where the people were.
The second move, from Kirtland to Independence, Missouri came about for two reasons. The first being that Joseph Smith, whom the Church members considered a prophet, said that Zion would be built in Jackson County, Missouri. He sent some members there to establish Zion, with plans to move the entire Church membership there. Eventually, most Church members ended up leaving Kirtland due to persecution. The locals who were not members of the Church feared that the Mormons would begin to take over and influence the politics of the region, and essentially ran them out of the state.
The next move, from Independence to Nauvoo, Illinois came mostly because of persecution in Missouri. Joseph Smith had been imprisioned on false charges, and Govornor Lillbourn W. Boggs issued an 'Extermination Order' to "kill all Mormons, or drive them from the state". Several homes were burned and men kidnapped by mobs, so they moved to Illinois.
The next move, from Nauvoo to Salt Lake City, came because Joseph Smith had been murdered and the state of Illinois asked the Mormons to leave the state by the winter of 1846. In deciding where to go next, Brigham Young suggested they go west to the Rocky Mountains, since Joseph Smith had prophesied that the Church would eventually have to move to the Rocky Mountains to escape persecution.
The Mormons traveled west in wagons, with handcarts and later by train.
The Mormons
After the Book of Mormon was found, people became angry. They martyred the Prophet Joseph Smith. Afterwards, persecution for the Mormons became worse, and they decided to move to Utah for a place to live without persecution.
The Homestead Act was a push factor in people's decision to move to the Plains because people were paying close to nothing for 160 acres of land.
young wanted to move the Mormons far from hostile neighbors
The Mormons were searching for a place where they could practice their religion in peace and found that place in Utah.
Nobody. The Church of Jesus Christ of Latter-day Saints (the "Mormon" church) was founded in the US - so the first Mormons were already in the US! :) If you are speaking of the first Mormons to move from another country to the US, rather than the first Mormons ever in the US, the answer is still nobody. The first Mormons to move from another country to the US came from Canada, and were not 'brought' by any specific person, only encouraged to move so that they could be nearer to the main body of the church.
Many of what are now the Western United States were settled by "Mormons." You may be referring to Utah, however, which was the primary destination of the move west.
The Mormons moved out of Kirtland, Ohio because they were being pursecuted and tortured by mobs. There was never a largely Mormon town called Kirkland.
I believe you are asking about Kirtland, Ohio. There was never a large Mormon settlement in any town called "Kirkland". The main body of Mormons began to move to Kirtland in 1831 after a large conversion took place there.
yes because they were looking for food to and land
The Mormons were being persecuted in the Eastern United States, and they decided to move West to form their own settlement, where they would be free to live as they pleased and according to their own religious rules, free from persecution.