The Great Famine

1. Emmigration

1.1. Coffin Ships

2. Decline of the Irish Language

2.1. Irish speakers emigrated from their homes.

3. Potatoe Failure

3.1. Bad Weather

3.2. New node

4. Declining Population

4.1. Coffin Ships

4.1.1. http://www.irish-genealogy-toolkit.com/coffin-ships.html

5. Growth of Irish communities around the world.

5.1. Irish people moved to other parts of the world in huge numbers including America, England and Australia.