Q: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
Passage: The U.S. government has engaged in efforts to counter Islamism, or violent Islamism, since 2001. These efforts were centred in the U.S. around public diplomacy programmes conducted by the State Department. There have been calls to create an independent agency in the U.S. with a specific mission of undermining Islamism and jihadism. Christian Whiton, an official in the George W. Bush administration, called for a new agency focused on the nonviolent practice of "political warfare" aimed at undermining the ideology. U.S. Defense Secretary Robert Gates called for establishing something similar to the defunct U.S. Information Agency, which was charged with undermining the communist ideology during the Cold War.
A:
How long as the Canadian government been actively engaged in efforts to counter Islamism?