Question

Which pair of countries that gained independence in the 20th century experienced the migration of millions of people across their shared borders due to religious tensions?

Answer 1

I think that the question means India and Pakistan.

India and Pakistan gained independence from the UK in 1947, and before this, they were the same country.

They split along religious lines and there was a huge migration after the Partition of India -and many people died during this migration, too.