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The first Montessori school opened in the Edward Harden Mansion in Sleepy Hollow, New York.
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Montessori first traveled to the United States for a three week lecture tour.
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Over 100 Montessori schools were operating in the U.S.
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From 1950's through the 1970's grew due to parents having ideals that aligned with Montessori's work.
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Nancy was familiar with some of Montessori's writings and wanted to attend Montessori Congress to learn more. It was here that she met Mario Montessori, Maria's son.
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Whitby School opens in Greenwich, Connecticut, in 1958, in a renovated barn.
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Nancy McCormick Rambusch was appointed the representative of AMI in the United States.
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Nancy McCormick Rambusch founded the American Montessori Society.
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Rambusch, the Whitby School and the American Montessori revival were published in a Time magazine article that led to growth of the Montessori Movement.
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Mario Montessori, Nancy McCormick Rambusch and others sign an agreement between AMI and AMS.
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American Montessori Society now stands as a professional organization that advocates for Montessori education worldwide.