Final answer:
Ontario and Quebec are the two Canadian provinces that produce more than three-quarters of the country's manufactured goods. They are strongholds of Canada's manufacturing sector and have well-developed industries that span from automotive to technology and biotech.
Step-by-step explanation:
The two provinces that produce more than three-quarters of Canadian manufactured goods are Ontario and Quebec. These provinces have been central to Canada's industrialization since the 1850s, with early factories in Toronto and Montreal producing textiles, metal goods, and other products. As the Canadian economy has shifted towards a service sector and knowledge-based economy, these regions have maintained their manufacturing strength. Ontario, in particular, is known for its automotive and technology industries, while Quebec has a diverse economic base that includes aerospace, information technology, and biotech sectors. Both provinces benefit from well-developed infrastructure and proximity to the United States, making them key players in North American trade.