- Montessori education was established in Europe in the early 1900s and came to America in the early 20th century, spreading rapidly through private schools. - In the 1950s-60s, the American Montessori Society was formed and sought to integrate Montessori into public schools and American culture more broadly. - Tensions emerged between the traditional, integrity-focused approach of the Montessori movement and the American tendencies towards innovation, anti-intellectualism, liberalism, and exceptionalism. - Today there are over 4,000 Montessori schools in the U.S. and the movement continues to grow and diffuse both in America and worldwide, while also facing new challenges.