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Your application is admissible if you have only resided in Canada or the U.S. during the past three years from the date of your application, subject to exceptions.
You do not have to have full three years in either country, but the residential stays have to be consecutive. You need to be prepared to provide evidence of your past residency (e.g. leases, I-94, work permit, study permit, I-20).
The exact wording of the Canadian regulations is
[The person] (f) subject to subsection (2), has resided only in one or more of the following countries during the three-year period before the day on which the application was received and until the day on which the authorization is issued: (i) Canada or the United States, [...]