(170819) -- TORONTO (CANADA), Aug. 19, 2017 (Xinhua) -- An inflatable milk cow is seen at Canadian National Exhibition in Toronto, Canada, on Aug. 18, 2017. The United States opened the 23-year-old North American Free Trade Agreement (NAFTA) renegotiations Wednesday with a declaration that it wants major changes to the agreement that shifts the balance of trade. However, Canadian business owners are hoping U.S. negotiators will be receptive to maintaining, if not improving, the current flow of goods and workers across the border. Although the Canadian dairy industry was excluded from the original NAFTA deal in 1994, its supply management system for dairy has long been a point of contention with the United States. U.S. President Donald Trump has vowed to push Canada for greater access to its markets for American dairy products in the NAFTA talks. (Xinhua/Li Haitao)