In 1838, the British politician Lord Durham was sent to British North America to investigate the causes of the rebellions of 1837–38 in the colonies of Upper and Lower Canada. Durham's famous Report on the Affairs of British North America (1839) led to a series of reforms and changes. These included uniting the two Canadas into a single colony, the Province of Canada, in 1841. (See also: Act of Union.) The report also paved the way for responsible government. This was a critical step in the development of Canadian democracy. The report played an important role in the evolution of Canada’s political independence from Britain.