historicity of book of mormon

Is the Book of Mormon is an authentic translation of an ancient volume of scripture? Did the family of Lehi actually leave Jerusalem and build ships to cross the ocean and settle in the Americas? Are the native Americans remnants of Nephite and Lamanite civilizations? Did the Jaredite people also settle in the new world after they left the tower of Babel? Are the people and events in the book true and did they literally happen?

Profiles with historicity of book of mormon on their "shelf":