Well, the real - life events were the foundation. In the movie, the plot follows the general trajectory of what actually happened. For instance, if in real life there were specific areas that were hard to traverse, the movie would show the characters facing the same difficulties in those areas. Also, the relationships between the people in the real - life events were mirrored in the movie's plot to make it more authentic.
The real - life events had a profound impact on the movie's plot. Since it's based on a true story, the plot had to stay true to the essence of what happened. The real - life journey's length and the various stops along the way were translated into the movie. The characters' motives in the movie were also based on the real - life people's motives. For example, if the real - life group was motivated by the hope of a better life at the end of the journey, the movie characters would have the same motivation. This connection between real - life and the movie's plot makes the story more engaging and believable.
The real - life events provided the basic framework for the movie's plot. The challenges faced in real life, like the geographical difficulties and survival needs, were directly incorporated into the plot. So, the movie's plot shows the characters going through similar hardships as in real life.