that's wrong.
the first paragraph is mostly right (starting at "An American").
the rest is wrong.
we don't believe that Jesus was native American. we believe that a group of people from Jerusalem left at around 600BC (Jeremiah's time) and travelled to America by boat. they set up a colony and over the thousand years that the record is kept (called the Book of Mormon), the nation split into two, the Lamanites and Nephites, Christ visit these people after his death (John 10:16- "And other sheep I have, which are not of this fold: them must I also bring, and they shall hear my voice; and there shall be one fold, and one shepherd.")
After Christ's visit there was peace for a hundred years or so until the people fell back into war, leading to the destruction of the Nephites and the population of the Americas by the Lamanites- ancestors of Native Americans. Joseph Smith was no rascist patriot.
One of the men assisting Joseph in the translation of the plates, Martin Harris (Joseph would translate and Martin Harris scribed), begged Joseph to let him show a section of translated text to his wife, Joseph prayed and was told not to, but Martin Harris persisted, so Joseph begged the Lord and after several times the Lord gave Joseph permission to let Martin Harris show his wife. His wife and the group of people she was part of that wanted to destroy the church took the translations and basically rewrote them out with different words so that when the prophet retranslated them they could say that there were mistakes because there were differences. However, the Lord commanded Joseph not to retranslate that section of the plates and move to another section. The translation that was lost is known as the lost 116 pages.
After the full translation of the Gold Plates into The Book of Mormon, (which we treat as scripture because the Nephites and Lamanites had prophets that were inspired of God, just like old testament prophets), the church progressed ie. restoration of the Priesthood, ordinances eg. baptism, and the movement west to Utah. Since then it's become a world wide church. We follow the Lord Jesus Christ as the saviour and redeemer of the world, we teach from the Bible and Book of Mormon and other revelation the prophet Joseph received, we have a living prophet Gordon B. Hinkley and we follow his counsel. If you want more try
www.mormon.org because it is the official site of the church and won't tell lies or give any wrong impressions like South Park, I don't know what their source was but it's not true.