It adopted the American Puritan view that America was the new chosen land and that Zion would be built on this continent (the Puritans called Boston the new Zion). Brigham Young's trek West was a reenactment of the events lived in ancient Israel and was a fulfillment of the American Puritan influence, an influence that also led to the near extermination the indigenous population of North America, treating the Indians as though they were Cananites and Americans were the new children of Israel given the whole continent by God as was embodied in the national policy of Manifest Destiny.
***Fall of Adam and of Man scriptures:
2 Nephi 2:4
And thou hast beheld in thy youth his glory; wherefore, thou art blessed even as they unto whom he shall minister in the flesh; for the Spirit is the same, yesterday, today, and forever. And the way is prepared from the fall of man, and salvation is free.
2 Nephi 2:25
Adam fell that men might be; and men are, that they might have joy.
2 Nephi 2:26
And the Messiah cometh in the fulness of time, that he may redeem the children of men from the fall. And because that they are redeemed from the fall they have become free forever, knowing good from evil; to act for themselves and not to be acted upon, save it be by the punishment of the law at the great and last day, according to the commandments which God hath given.
2 Nephi 9:6
For as death hath passed upon all men, to fulfil the merciful plan of the great Creator, there must needs be a power of resurrection, and the resurrection must needs come unto
man by reason of the fall; and the fall came by reason of transgression; and because man became fallen they were cut off from the presence of the Lord.
And even if it were possible that little children could sin they could not be saved; but I say unto you they are blessed; for behold, as in Adam, or by nature, they fall, even so the blood of Christ atoneth for their sins. (Especially interesting since this is a very good re-statement of the Orthodox belief on children and the fallen nature of all humans, young and old).
For the natural man is an enemy to God, and has been from the fall of Adam, and will be, forever and ever, unless he yields to the enticings of the Holy Spirit, and putteth off the natural man and becometh a saint through the atonement of Christ the Lord, and becometh as a child, submissive, meek, humble, patient, full of love, willing to submit to all things which the Lord seeth fit to inflict upon him, even as a child doth submit to his father.
Therefore, they have drunk out of the cup of the wrath of God, which justice could no more deny unto them than it could deny that Adam should fall because of his partaking of the forbidden fruit; therefore, mercy could have claim on them no more forever.
I say, that this is the man who receiveth salvation, through the atonement which was prepared from the foundation of the world for all mankind, which ever were since the fall of Adam, or who are, or who ever shall be, even unto the end of the world.
Now Alma said unto him: This is the thing which I was about to explain. Now we see that Adam did fall by the partaking of the forbidden fruit, according to the word of God; and thus we see, that by his fall, all mankind became a lost and fallen people.
Now when Ammon had said these words, he began at the creation of the world, and also the creation of Adam, and told him all the things concerning the fall of man, and rehearsed and laid before him the records and the holy scriptures of the people, which had been spoken by the prophets, even down to the time that their father, Lehi, left Jerusalem.
And Aaron did expound unto him the scriptures from the creation of Adam, laying the fall of man before him, and their carnal state and also the plan of redemption, which was prepared from the foundation of the world, through Christ, for all whosoever would believe on his name.
Yea, behold, this death bringeth to pass the resurrection, and redeemeth all mankind from the first death--that spiritual death; for all mankind, by the fall of Adam being cut off from the presence of the Lord, are considered as dead, both as to things temporal and to things spiritual.
Behold he created Adam, and by Adam came the fall of man. And because of the fall of man came Jesus Christ, even the Father and the Son; and because of Jesus Christ came the redemption of man.
Every spirit of man was innocent in the beginning; and God having redeemed man from the fall, men became again, in their infant state, innocent before God.
And he said unto them: Because that Adam fell, we are; and by his fall came death; and we are made partakers of misery and woe.
JST Genesis 6:49
And he said unto them, Because that Adam fell, we are; and by his fall came death, and we are made partakers of misery and woe.
God has not left us alone. He has given us many signs to help us find our way back to him. Don't get lost in false detours.