I wonder what is the main or stronger determinant of whether new immigrants from the same part of the world choose to live alongside old immigrants from the same area or choose to form new enclaves wholesale (which could be in the suburbs or be in the city but still located far from the historic enclave). Wealth differences? Cultural affinity, or time or generations between the immigration waves (where the farther apart in time any two waves arrived, the less affinity they'd have community-wise)?
Wealth seems to be a big one (eg. look at all the enclaves that disappeared once wealthy suburbs became within reach and new upscale ethnoburbs formed), but in terms of cultural affinity it seems to vary. In some places, communities (eg. post-Soviet Eastern European immigrants such as Polish vs. much older waves from the same country) of the "same" ethnicity may not live together as they can feel like they have nothing in common, but on the other hand immigrants from the same part of the world can still choose to create a common community (eg. West Indians from places like Jamaica, Trinidad, Guyana etc. sometimes live together in Caribbean neighbourhoods, Chinese and Vietnamese living together in Toronto/Montreal etc. or even pan-(East) Asian districts of multiple ethnic origins forming in places like Cleveland).