Assuming you mean people that came to Western America during the gold-rush...
Forty-Niners
...As this mass movement of people sparked by the discovery of large amounts of gold happened in 1849.
pioneer
Gold
This was the time of the California Gold Rush, in which hundreds of thousands of people flocked to California hoping to strike it rich.
People flocked to California because they were seeking gold and riches, and gold had been discovered there.
People flocked to California in the late 1840s and 1850s because of the discovery of gold. Later, people realized that there were many other resources available.
Among the so-called forty-niners, the prospectors who flocked to California in 1849 in the gold rush, were people from Asia, South America, and Europe. San Francisco's population exploded from 1,000 in 1848 to 35,000 in 1850.
People in California are called Californians.
People flocked to California because they were seeking gold and riches, and gold had been discovered there. The Mormons changed the landscape of the west by moving there and establishing cities and towns in areas that were previously uninhabited.
People flocked to California in the late 1840s and 1850s because of the discovery of gold. Later, people realized that there were many other resources available.
the prospectors who flocked to California in 1849
Among the so-called forty-niners, the prospectors who flocked to California in 1849 in the gold rush, were people from Asia, South America, and Europe. San Francisco's population exploded from 1,000 in 1848 to 35,000 in 1850.
The cows flocked together to stay warm.
Californians