Final answer:
Chileans came in large noticeable numbers to California during the Gold Rush.
Step-by-step explanation:
The group of South Americans that came in large noticeable numbers to California during the Gold Rush were the Chileans. They were attracted to California by the discovery of gold in the mid-19th century. Chilean miners played a significant role in the development of mining towns and their culture left a lasting impact.
Learn more about Chileans in the California Gold Rush