Answer:
B. Discovery of Gold
Step-by-step explanation:
The California Gold Rush of 1848–1855 attracted hundreds of thousands of ambitious young people from around the world. On January 24, 1848, James W. Marshall discovered gold at Sutter's Mill, near Sacramento, California. Soon, tens of thousands of immigrants from around the world traveled to California hoping to find wealth in the mines or to take advantage of the burgeoning business opportunities in the freespending gold rush economy.