The potato blight in the country called Ireland was a situation that caused people to freely migrate.
This was the event that caused the Irish people to leave their country in droves.
The reason the people were migrating was in order to flee from hunger and also poverty from 1845 to 1852.
The consequence of the blight was a permanent change in the demography of Ireland.
Read more on the Great migration here: https://brainly.com/question/21201