Why was the early West considered a "crossroads of culture"?

Mexico originally owned the land, so the cultures of Americans, Mexicans, and Native Americans were all present in the West.
The California Gold Rush brought in people from all over the world, which resulted in cultural diffusion among the settlers there.**
California was known to accept many forms of religion and ethnicities, so people from different cultures migrated there to start new lives.
Those settlers who brought slaves with them to the West created cultural interactions between Native Americans, African Americans, and themselves.

meant WH

I believe it is B

I agree with B.

The early West was considered a "crossroads of culture" for a few reasons. Firstly, Mexico originally owned the land, so there were already established cultures of Americans, Mexicans, and Native Americans present in the region. Secondly, the California Gold Rush in the mid-19th century attracted people from all over the world, resulting in a significant influx of settlers from different countries and cultures. This led to cultural diffusion among the diverse group of settlers in California. Additionally, California was known for accepting people from various religions and ethnicities, which further contributed to its multicultural nature. Lastly, the presence of settlers who brought slaves with them to the West created cultural interactions between Native Americans, African Americans, and themselves. These various factors combined to make the early West a melting pot of cultures and a significant crossroads for cultural exchange.

and this is math how?