Ask your friend for a copy of the Book Of Mormon, or go to any book store and buy a copy by Doubleday. You will get the true facts from the book. You have misunderstood your friend drastically. It was Lehi and his sons, and wives who came from Jerusalem,(don’t know if they were Jewish, Lehi may have been, but the wives may not have been) in about 600 BC and settled somewhere in the Yucatan or Central America. There were already other settlers in America from long before that, later they intermarried with other tribes. Jesus did appear soon after his death to the people on this hemisphere. When he returned to the apostles and they asked him where he had been. He said"know ye not that I have other sheep?" He loved all of his people equally, not just the people of the Middle Eastern countries. For the rest of the story read the Book.
We are called the Church of Jesus Christ of Latter Day Saints, because Jesus set up His church in Biblical times with his name, because he was the head of the Church. When He restored the church in it’s original form through his prophet Joseph Smith in 1830 as it was before about 500AD, he added the Latter Day Saints to distinguish between the original and the present day restored Church.
Moroni was the son of Mormon, and the last man to write in the Book of Mormon. He was one of the last survivors of his tribe and wandered for many years, ending up in what would later be New York. Before his death, he buried the record of his people which was engraved on thin gold plates. When the Lord was ready for the church to be restored, he and his son appeared to Joseph Smith as an answer to his prayer. He was 14 and confused with all the religions, his own family was torn between religions. He came upon the passage in the bible “If any of ye lack wisdom, let him ask of God, who giveth to all men liberally and upbraideth not, and it shall be given.”
Both God the Father and his son Jesus Christ appeared to the boy Joseph, in a grove of trees near his home, and told him that he was not to join any of the churches, because they had all been corrupted by man, and though they contained many good things, none of them contained the whole, complete truth.
Then after a period of time Moroni appeared as an angel and gave Joseph the instructions he needed before showing him the hidden plates. Moroni is the golden angel atop all 120+ LDS Temples all over the world.

BJ