This chapter looks at the impact of the American Revolution and its war on both Britain and Ireland. Its central concern is to explore whether Britain and Ireland can be incorporated in the Atlantic Revolution thesis, first advanced by Robert Palmer, which suggests the migration of revolutionary impulses eastwards. The argument developed here lays less emphasis on the inspiration provided by the democratic ideas associated with the American Revolution than on the importance of British military setbacks and ultimate defeat in the War of American Independence. It also highlights domestic and wider imperial influences on reform within Britain and Ireland, which also seem to have played a more significant role than the democratic tendencies of the American Revolution. By no means all the different reform programs and proposals in Britain and Ireland envisaged movement in a democratic direction. Indeed, the chapter makes the case for our considering most of the calls for reform in this period as attempts to turn the clock back, and recover lost or declining safeguards against misrule, or remedy long-standing grievances, rather than as forward-looking attempts to embrace democracy.