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Extra Evidence

"...I make a record in the language of my father, which consists of the learning of the Jews and the language of the Egyptians."  (1 Nephi 1:1-2)
"...we have written this record...in the characters which are called among us the reformed Egyptian... And if our plates had been sufficiently large we should have written in Hebrew; but the Hebrew hath been altered by us also..."  (Mormon 9:32-33)
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The language of Joseph Smith, all of his family, friends and associates in 1830 were English not Hebrew or Egyptian.  The Book of Mormon was translated and published in English for the first time in 1830. 

Since 1830 AD various discoveries have been made that show that the Book of Mormon has all throughout it Semitic style writing.  The Book of Mormon original authors left evidence of word structure, style, expressions and phrases that their cultural heritage and language background was of a "Hebrew" or "Semitic" ancestry.   
The following evidence indicates that the Book of Mormon could in no way have been authored by Joseph Smith, Sidney Rigdon, Oliver Cowdery, Solomon Spaulding, or anyone else living in the United States in the 1800's AD  
The Book of Mormon original authors had a Hebrew or Semitic ancestral background.  
[The Semitic languages include Syrian, Hebrew, ancient Egyptian, Arabic, and Aramaic.]