Campbell's inclusion on the list has historians in this country shaking their heads.
"It's ridiculous," says Michael Bliss, an author and historian at the University of Toronto.
But the American editor of the Almanac says Campbell belongs in the pantheon of historical greats for the simple reason she was Canada's first female prime minister.
"Given that there have not been that many females who have led nations, we chose to include her," says Jane Sunderland, a project manager at the Washington D.C.-based society.

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Canadian pride may not rest on our sleeves, but it resides deeply in our hearts.
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"There is no substitute for militant freedom." --US President Calvin Coolidge
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If I stand for my country today...will my country be here to stand for me tomorrow?