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The evolution of Miami Beach from a small, uninhabited strip of palmetto scrub and swamp into an internationally-renowned resort is a fascinating tale of human ingenuity, endurance, and forsight. A milstone in the city's development, the year 1920 marked many significant improvement, such as the new County Causeway bridge, and many "firsts" for the expanding hamlet, including the first electric trolly, the first automated telephone system, and its first post office building.