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The Alabama Claims, 1862–1872
Charles Sumner, Chairman of the Senate Foreign Relations Committee, argued that British aid to the Confederacy had prolonged the Civil War by 2 years, and indirectly cost the United States hundreds of millions, or even billions of dollars (the figure Sumner suggested was $2.125 billion). Some Americans adopted this argument and suggested that Britain should offer Canada to the United States in compensation.

https://history.state.gov/milestones/1861-1865/alabama