What countries have Bangla as their second language?

There isn't a clear definition of "second language" for a country. It's more common to talk about official languages or languages widely spoken.

While Bangla is the official language of Bangladesh and the second most spoken language in India, it's not officially recognized as a "second language" in any other countries.

However, Bangla is spoken by significant minority populations in several countries, including:

* India: It's spoken by over 100 million people in West Bengal, Assam, Tripura, and other regions.

* Pakistan: Bangla is spoken by a large population in the Sylhet division of Bangladesh.

* Myanmar: A significant number of Rohingya refugees in Myanmar speak Bangla.

* United Kingdom: There are large communities of Bengali speakers in the UK, especially in London.

* United States: The US also has a growing Bengali-speaking population.

It's important to remember that language use is complex and varies based on region, community, and individual preferences.