khom zaath and besh zaath

[Wais_Islam]

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khom zaath ar besh zaath? what has a country almost underwater all year round has that differentiates these two groups? is it something that was inherited from the british colonialists?
are ppl with choudhury surnames real choudhuries, or do they change it on the passport after going abroad?

what is all the fuss abt, after all we all speak bangla, eat the same food etc. why do ppl call ppl khom zaath, like for example, boy4rombengal called sheehab/ashad a 'maimol'???

pls giv ur views on this topic of aristocracy. thanks.