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In page Sedevacantism:

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There are estimated to be between several tens of thousands and more than two hundred thousand sedevacantists worldwide,[citation needed] mostly concentrated in the United States, Mexico, Canada, France, the United Kingdom, Italy and Australia, but the actual size of the movement has never been accurately assessed. It remains extremely difficult to do so for a wide range of reasons, such as the fact that not all sedevacantists identify as such, nor do they necessarily belong to avowedly sedevacantist groups or societies.[1]