The War of 1812 is often credited with having aroused fierce anti-American sentiment among Upper Canadians, creating a unity which ensured continued loyalty to Britain and played an important role in the defence of the colony. It is also claimed that all of Upper Canada benefited from British military spending, setting the colony on a course towards prosperity. In this revisionist history George Sheppard challenges these assumptions.

Sheppard demonstrates that the colony was a fragmented and pluralistic community before the war and remained so after it. Upper Canadians were divided by racial, religious, linguistic, and class differences, and the majority of settlers had no strong ties to either the United States or Britain, with most men avoiding military service during the war.

Reviewing the claims submitted for damages attributed to the fighting, he argues that British forces as well as enemy troops were responsible for widespread destruction of private property and concludes that this explains why there was little increase in anti-American feeling after the war.

Much of the wartime damage occurred in areas west of York (now Toronto). This was the cause of grievances harboured by settlers in the western part of Upper Canada against their eastern counterparts long after the war had ended. As well, some Upper Canadians profited from wartime activities while others suffered greatly. Only later, in the 1840s when these issues had faded from memory, did Canadians begin to create a favourable version of wartime events.