Answer:
The aspect of Gold presence
Step-by-step explanation:
In the mid 1800s Gold was discovered in California by James W. Marshall, there by making Americans in and outside California to rushed or showed interest in mining the Gold in California. This period is termed as "Gold Rush" and it brought about 300,000 americans and others from abroad into California, of which most were minners.
It was a period of boom for California that lasted between 1848 - 1855.