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the Political Philosophy
Progressivism is a term that encompasses a wide spectrum of social movements that include environmentalism, labor, agrarianism, anti-poverty, peace, anti-racism, civil rights, women’s rights, animal rights, social justice and political ideologies such as anarchism, communism, socialism, social democracy, and liberalism. 
Progressivism is a Left Wing Philosophy based on the Idea of Progress which affirms that advances in Science, technology, economic development, and social organization can improve society to a level where more people can live good, happy lives. Conservatives dislike this concept because they believe in tradition and personal responsibility (hence the term "Regressivism"), however the fact that people have used these aforementioned tools to build the modern world is direct evidence that progress works once everyone start to band together using their reason and skills. For there not divinely ordained but rather self-assembled into a social species as a result of evolutionary processes.
Progressives believe that individuality, progress, and change are fundamental to one's education. Believing that people learn best from what they consider most relevant to their lives, progressivists center their curricula on the needs, experiences, interests, and abilities of students. Progressivist teachers try making school interesting and useful by planning lessons that provoke curiosity. In a progressivist school, students are actively learning. 
Progressives were at one time a faction of the Republican Party, were some of the Party's beloved and successful members. The Progressive wing of the Republican Party reached it's peak during the Progressive Period, remained a distinct faction of Republicans into the 1950's, but are now extinct. Theodore Roosevelt was a notable Progressive Republican.