Answer:
Common ideology and religion.
Explanation:
The main reasons for this group of people have for migrating to Pakistan is the presence of common ideology and same religion of people. Millions of people migrated to Pakistan when the Pakistan was formed because of the worse behaviour of Hindus in India with these people due to their Muslim identity. The presence of Muslims, common ideology and worst attitude of Hindus attracts these people to migrate to Pakistan in order to live a peaceful life.
