Final answer:
Canada enforces a policy that requires a specific percentage of content on radio and television broadcasts to be of Canadian origin or have significant Canadian content to protect its culture.
Step-by-step explanation:
The government that imposes minimum levels of required national content on their television and radio broadcasts is Canada. This policy is a response to the large consumption of American popular culture by Canadians, which raised concerns about the potential loss of unique Canadian cultural characteristics. To protect and promote Canadian culture, a law was passed mandating that a certain percentage of content broadcasted on Canadian radio and television stations must be of Canadian origin or have significant Canadian content.