Answer: The geographical barriers they faced are the great plains, the rocky mountains and the Sierra Nevada.
Explanation:
After California's annexation in 1848 to the United States of America, and the discovery of gold in the region the same year, many colonists undertook the difficult journey of reaching California.
The colonists who wanted to reach Californía first had to cross the great plain, there it was difficult to find food or hunt, therefore, they had to bring their food. They were also attacked by Indian tribes or suffered from a lack of water. Then, they had to cross the Appalachians, and later the Sierra Nevada.
This led to a high level of mortality among settlers who succumb to the terrain, starvation, disease, or attack by American Indians.
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