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Ever since 1919, there have been plans to build a subway line on Manhattan's east side under Second Avenue. But each time that funding was obtained and/or construction began, the line was cancelled. Current work on the line finally began in 2007, with phase 1 planned to open at the end of this year (or more likely sometime next year).
Under what alternate circumstances would this long-proposed segment of a New York City infrastructure be at least partly completed and in use before the current millennium?