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The Paleozoic (or Palaeozoic) Era "old" and zōḗ, "life", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from 541 to 251.902 million years ago, and is subdivided into six geologic periods (from oldest to youngest): the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian. The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon and is followed by the Mesozoic Era.
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The US sought to defend its eastern border from attack and drive Spain from power in the Americas.
Diego Rivera was a celebrated Mexican artist famous for his fresco murals that often depicted ... He sought to expose the working man to his art by creating large-scale images in public places.Diego Rivera had 146 paintings and murals. Rivera is generally acknowledged to be one of the most important artists of this century, and its most influential muralist.
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