The correct answer to this open question is the following.
Although there are no options attached we can say the following.
If all the emigrants who traveled west had known in advance the difficulty of life on the trail, how might that have changed the "great migration" and Manifest Destiny?
Of course, it could have affected the decision in terms of when to emigrate, but I do not think that could deter white Americans from trying to leave their former lands to settle new ones with the hope of farming new lands and make great profits.
Another important thing. Knowing beforehand the many difficulties or risk the journey had, they could have taken some provisions to be relatively prepared to face and overcome those conditions.
However, there were big inconveniences. Let's have in mind the Great Plains when severe drought followed the removal of native grasses and strong winds blew away topsoil and created a Dust Bowl.
In the 1930s, the Great Plains lived difficult moments when severe dust storms hit this region of the United States. The dryness due to lack of water, the removal of native grasses, combined with climate conditions, produced these dust storms that killed animals and ruined the crops. There was no way to keep on farming the land and people had to move to the Pacific West, to California, where they had to start a new life.
