Answer:
From primary and secondary sources.
Explanation:
Researchers depend on whatever information has been left behind by the event. Archaeologists check the information for accuracy using secondary data sources.
Original sources are all first accounts of history recorded by a living individual on the basis of an occurrence. Secondary data sources are recorded descriptions of historically based upon primary evidence.
Im sorry but is this question complete
The Gold Rush had affected a lot of indigenous people living in California, wherein indigenous people were pushed off their lands and were attacked by gold hunters or also known by the term "forty-niners". The term originated from the year that the gold rush had happened. After the gold rush, the population of California rose, and diseases, genocide and starvation had decreased.
