Actually, yes you can, in a way. Some people seem to think that teaching Canadian history equates to imposing dominant culture on (certain) minorities. The educational system is now bent on not trying to offend people from other cultures, recent immigrants, who have their own histories and cultures that apparently are more important to protect than our own. There are certainly some aspects of Canadian history that are not pleasant, but our forefathers recognized this and have made efforts to change this, and in many cases have been successful; Canada has a high standard of living and its citizens freedoms and rights denied to many others as a result. Ignoring our past, not understanding it, or allowing certain agendas to "revise" it, will only lead to further problems.
An excellent book to read on this subject: Who Killed Canadian History?