American Revolution (1775-1783): Nova Scotia played a significant role in the American Revolution. Many American privateers operated out of Nova Scotia, raiding British shipping. The British also used Nova Scotia as a base to launch attacks against the American colonies.
War of 1812 (1812-1815): The War of 1812 was another conflict between the United States and Britain. Nova Scotia was again a key location for the British. The British used Halifax as a naval base, and the province also served as a staging ground for attacks against the United States.
Fenian Raids (1866-1871): The Fenian Raids were a series of invasions of Canada by Irish-American Fenians. The Fenians hoped to overthrow British rule in Canada and establish an independent Irish republic. Several of the raids took place in Nova Scotia, but the British were ultimately successful in repelling them.
World Wars I and II (1914-1918, 1939-1945): Nova Scotia played a significant role in both world wars. During World War I, the province was a major training ground for Canadian troops. Halifax also served as a major port for Allied shipping. During World War II, Nova Scotia was again a training ground for Canadian troops. The province also hosted several military bases, and Halifax was a major port for Allied shipping.