The Word of God tells us all the time to beware of the false teacher and false prophets who lead people astray. It only takes a few minutes out of the day to check on simple things, you should be concerned that the Mormons would use words like ‘machinery’ in the supposed year of 399 BC. This word came from the word machine which originated in 1540-1550 AD. It is a French word that came from the Latin “machine” which came from the Greek word “machana”.
Another thing to keep in mind is that Smith said there were no Greek or Latin words on the plates from which he translated the words for the Book of Mormon.
How could a word that originated in 1540 show up in a work produced 1,900 years prior?
Jarom 1:8; “And we multiplied exceedingly, and spread upon the face of the land, and became exceedingly rich in gold, and in silver, and in precious things, and in fine workmanship of wood, in buildings, and in machinery, and also in iron and copper, and brass and steel, making all manner of tools of every kind to till the ground, and weapons of war—yea, the sharp pointed arrow, and the quiver, and the dart, and the javelin, and all preparations for war.”