The emigration of the Scots from the 18th to the 20th century has produced a diaspora. The thesis outlines how many diasporas are involved in the nationalist projects of their homeland. However, over the chronology of this study and beyond, whilst there were active movements to amend or end the Union of 1707, it has been found that the Scots were not. The thesis then proposes some explanations for this. Chapters one and two introduce methods, research material and context; they describe the Union, the emigrations and diasporas. The study uses for comparison purposes the Irish and Norwegian diasporas. Lines of enquiry such as nationalism, the use of soft power and gatekeeping behaviour are presented, with a discussion of Scottish nationalism. The study examines the approach to involving the diaspora of five groups; both SHRAs, the International Scots Home Rule League, the National Convention and the NPS/SNP. The response of Scottish MPs in the diaspora in England to the many attempts to legislate for home rule is also examined. The approach to the diaspora was found to be badly executed and targeted. Few visits were made, and only to the US and Canada. Communication was unfocussed and spasmodic. The Scottish associational clubs were frequently used as a conduit. A small part of the whole diaspora, these acted as gatekeepers, selectively mobilising for themselves as an elite which had no need of nationalism as they could succeed without it. Comparing the Irish, whose diaspora successfully supported its nationalist causes at home, is instructive. The study concludes that the spasmodic and amateurish nature of contact, the nature of the Associations and that of the diaspora itself were the main culprits in this case of a diaspora indifferent to the fate of nationalism in its home land.