It's not about who's claiming what, it's about facts. Personally, I think there's definitely a migrant problem in some of our Northeastern states, one resident of Tripura himself attested to that in this thread. The below is an article from Kerala which is our Southern state which has many migrants not only from other states, but from Bangladesh as well.
THIRUVANANTHAPURAM: The exodus of migrants from all states shows no signs of ending as the COVID-19 pandemic expands its footprint across the nation. The revers
www.newindianexpress.com
Whenever there are migrants, there's bound to be frictions which is something very natural. It's not something which is just particular about India. You guys too had your fair share of problems when you were East Pakistan and were dealing with West Pakistan and that too when you were one country at that time. Migrants are good, they provide labour and improve the economy but when the number crosses a certain threshold, there are going to be clashes. And that migration can be both intranational and international.
Also, I don't think just considering GDP to decide on any kind of merger is the right way to go here. Why aren't you just happy with the fact that some of our states are boosting trade with your country which will eventually benefit both the countries.
Again, good to see BD performing well, you have benefits of a small country which is ethnically and linguistically homogeneous for the most part. I always believe smaller countries have a greater ability of developing quickly as compared to the bigger countries. You also don't have to deal with hostile neighbors so that's a bonus.