Religious Conflict: The Scots Irish were predominantly Protestant and faced religious persecution and discrimination in their homeland, particularly in Catholic Ireland. They fought for greater freedom of religion in the colonies.
Economic Opportunities: British colonies offered new economic opportunities, such as fertile land for agriculture and job prospects in emerging industries such as textiles and mining.
Political instability: The British Isles also suffered from political instability, particularly in Ireland, which made colonies more attractive.
In short, the Scots-Irish sought greater religious freedom and economic opportunity, as well as freedom from political instability in their homeland. The British colonies gave them an attractive new start.