'@Rogers' smaller sub-divisions within countries can be more or less culturally (values, preferences, view of history) homogeneous. With enough mobility, self-selection will happen on geographic or occupational level. One of the more obvious examples of that is military, especially elite units which have to rely on selection, indoctrination and tradition in order to achieve high levels of unit cohesion. On national level some commonality in values is possible, but it is likely to be vague. Having different understanding of term "culture" doesn't help either.
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'@Rogers' smaller sub-divisions within countries can be more or less culturally (values, preferences, view of history) homogeneous. With enough mobility, self-selection will happen on geographic or occupational level. One of the more obvious examples of that is military, especially elite units which have to rely on selection, indoctrination and tradition in order to achieve high levels of unit cohesion. On national level some commonality in values is possible, but it is likely to be vague. Having different understanding of term "culture" doesn't help either.