Ziggy Stardust said:

Two questions:

Why was Joseph Smith put into prison? Do you really believe that Adam and Eve lived in Missouri?

Joseph Smith was arrested several times in his life, defended himself in court around 48 times (according to Brigham Young, Joseph's successor), never faced a court proceeding on other occasions, yet was never convicted. Tough to answer your question, though this link might be helpful:

http://www.fairlds.org/FAIR_Conferences/2006_Legal_Trials_of_Joseph_Smith.html

His final arrest was for destroying a newspaper printing press that was printing inflammatory information about the Church, particularly regarding polygamy. He was ultimately assassinated while in jail in Carthage, IL for this charge.

As for the Garden of Eden, yes, we teach that it was here in what is now the American continent. Might seem weird given the various names of familiar places in the Old Testament, such as Ethiopia and the Tigris. However, mankind spread upon the earth, and it's not hard to believe that places received the same names. For instance, I live near Miami...in Arizona. On my mission in Georgia there were cities named Athens and Rome. It's not too hard to believe that different locations carried the same names.