Why might two groups of people living in the same area develop different cultures?
Differences of:
family background
economic status
educational status
What is your answer?
With acculturation, usually the whole group adopts the innovation.
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Why would two groups of people develop different cultures or blueprints about how they should behave. Why don't the people who live in a specific area all have the same culture and expectations about how to behave?
How about an area that has some people whose parents were born in other countries? They would enjoy different food and perhaps speak different languages and might follow a different religion.
What about the cultural differences between those with college educations who make high salaries and those with high school educations or who are very poor?