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https://www.britannica.com/topic/chinampa
A turning point usually introduces new people, ideas, and technology which results in different forms of government change in idea and even rebellions. So it can be thought of as a revolution because new things are showing up and change is happening.
National efforts to reduce environmental risk are based on the best available scientific information;federal laws protecting human health and the environment are enforced fairly and effectively
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United States, legal case in which the U.S. Supreme Court ruled on March 3, 1919, that the freedom of speech protection afforded in the U.S. Constitution's First Amendment could be restricted if the words spoken or printed represented to society a “clear and present danger."
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