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The lanthanide contraction is responsible for the fact that
Progressive Era
A period of widespread social activism and political reform in the United States from the 1890s to the 1920s, aiming to address issues stemming from industrialization, urbanization, and corruption.
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A task or situation that tests someone's abilities, often requiring effort to overcome.
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Individuals or groups advocating for changes in urban policies or practices, aiming to address social, economic, and environmental issues in city settings.
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