I'm going to quote a good friend of mine that has covered the topic of the "prophecies" that Joseph Smith gave and that were fulfilled...
"The Church of Jesus Christ of Latter-day Saints (sometimes incorrectly called the "Mormon Church") claims that the ancient office of prophet has not vanished from the earth and that Joseph Smith, Junior, was called as a prophet of Jesus Christ in the early 1800s to begin the Restoration of the Church of Jesus. If he was a prophet, did he make any valid prophecies? My answer is yes, and this page discusses some of the possible evidences for prophetic gifts. As with any discussion of religious matters, there is plenty of room for other opinions and disagreement - that's fine."
Here is an excellent link to his website: http://www.jefflindsay.com/LDSFAQ/FQ_prophecies.sh...
There is much "prophecy" that has been attributed to Joseph Smith and other past leaders of the LDS Church by those who are critical of the Church and its leaders -- which is false.
I would also add that neither the "History of the Church" or "Journal of Discourses" is considered doctrine.
I would also suggest to anyone with a sincere desire to know information about The Church of Jesus Christ of Latter-day Saints that they contact either a faithful member, our missionaries or even go online to: http://mormon.org/