Answer:
The Mexican cession in 1848 marked the transfer of California from Mexico to the United States and brought about a major shift in the cultural and ethnic composition of the state. As a result of the Gold Rush and the establishment of the transcontinental railroad, California saw an influx of people from all over the world, including immigrants from Europe, China, and the eastern United States.
Mexican Americans, who had lived in California for generations, were greatly affected by this change. Many lost their land and were forced to work as laborers on large, often white-owned, agricultural estates. They also faced discrimination and marginalization from the new immigrant populations and the American government. The increased competition for jobs and resources resulted in a decline in the standard of living for Mexican Americans, and they were often relegated to the lowest rungs of society.
Indians, who had inhabited California for thousands of years, also experienced the effects of the Mexican cession and the increase in immigration. They suffered greatly as their land was taken away and they were forced to live on reservations. The new immigrant populations brought with them diseases that decimated the indigenous populations, and many Native Americans were also subjected to violence and discrimination.
In contrast, the experiences of the new immigrant populations were quite different. The European immigrants found success as farmers, ranchers, and merchants, and they established communities that reflected their cultural and ethnic identities. The Chinese immigrants, who arrived in large numbers to work on the transcontinental railroad, faced significant challenges, including discrimination, poverty, and limited opportunities for employment. Despite these obstacles, the Chinese immigrants established their own communities, where they could preserve their cultural traditions and support each other.
In conclusion, the Mexican cession had a profound impact on the cultural and ethnic composition of California, and the experiences of the people who settled there after the cession varied greatly. Mexican Americans and Indians, who had lived in California before the cession, faced significant challenges, while the new immigrant populations, who arrived in search of new opportunities, had vastly different experiences. The increase in immigration brought about changes in the social, economic, and political landscape of California, and the effects of these changes continue to be felt today.