The main reason that Californians are different from Americans is that Californians live on an island, separated by a great distance from the main population of American (MAP).
The majority of Americans live between the I-95 freeway on the East Coast, and the I-35 freeway, almost literally half way through the center of America.
Californians live between the US-395 and the US-1.
The distance between the main population of Californians and MAP, is about half of the distance of America.
This map displays this distance best:
This is a gigantic amount of distance, equal to the land mass that separates the cultures of Europe from North Africa, China from India, North Muslim African from Central Christian Africa, The Portuguese speaking part of South America from the Spanish speaking part of South America.
The maps displaying global population density across all nations show this:
The point is that whenever you have two cultures develop this distance apart from each other, they always become very different peoples – simply due to geography.
After 400 years this map is still basically accurate in terms of understanding why Californians are so different from average Americans.
These are other maps that show the distance between the California population and MAP, looking at different features. Together they prove that this distance is a hard distance between peoples no matter what measure you look at: (look for a large cluster of infrastructure on the entire right half of the map, then a big gap in infrastructure from the half way mark till almost the border of California state, then another clustering of infrastructure).
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