The cultural transformation in the United States due to the early West can be primarily attributed to the second point: Because of the gold rush, many cultures came to the West and interacted with each other, resulting in cultural awareness for the United States.
The California Gold Rush starting in 1848 attracted a diverse group of people, including immigrants from China, Europe, and Latin America, alongside those from different regions of the U.S. This melting pot of cultures led to a significant exchange of ideas, customs, and practices, profoundly impacting American culture. As people from various backgrounds interacted, they shared their traditions, foods, religions, and languages, fostering greater cultural awareness and diversity in the nation.
While the other points touch on aspects of cultural interaction and change, they do not fully capture the wide-ranging impact that the influx of diverse populations during the Gold Rush had on American society. The mixing of cultures in mining camps, towns, and along trade routes encouraged new cultural dynamics that shaped the identity of the American West and, by extension, the entire country.