You have to take each culture on its own history and issues. Africans and Caribbeans will have different issues from Native Americans, or Jews.
Jews have been so spread out for so long that there are two distinct factions you can put most distinct cultural oddities under - the Ashkenazic (mostly eastern or northern European), and the Sephardic (mostly surrounding the Mediterranean and Middle East) - and then it's an endless subheading. These result in different food or pronunciation preferences. They have absorbed the culture from the countries they lived in. It's only the Chasidic Jews - the ultra-orthodox you see in places like New York with the black clothes, hats, and curls, who keep a more consistent look across borders. But the dispersal of Jews has been happening for some thousands of years - not just the hundreds that many African nations can claim. It may be they feel that the loss of their 'original' culture is still too close. I don't know.
Jews have been so spread out for so long that there are two distinct factions you can put most distinct cultural oddities under - the Ashkenazic (mostly eastern or northern European), and the Sephardic (mostly surrounding the Mediterranean and Middle East) - and then it's an endless subheading. These result in different food or pronunciation preferences. They have absorbed the culture from the countries they lived in. It's only the Chasidic Jews - the ultra-orthodox you see in places like New York with the black clothes, hats, and curls, who keep a more consistent look across borders. But the dispersal of Jews has been happening for some thousands of years - not just the hundreds that many African nations can claim. It may be they feel that the loss of their 'original' culture is still too close. I don't know.