The Irish Potato Famine, also known as the Great Famine, was a period of mass starvation and disease in Ireland from 1845 to 1852, primarily caused by a potato blight that devastated the staple crop. This catastrophic event not only led to the death of approximately one million people but also triggered a massive wave of emigration, shaping patterns of migration and demographic changes in both Ireland and other countries, particularly the United States.