It's Punky Brewster

How the Midwest Was Won (1x22)

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Punky and Allen have been protesting urban sprawl, and wants to see a nicer time before urbanization, so Glomer takes them to Chicago of 1803. There a man named Pierre LePelt is campaigning to stop a much smaller Chicago from expanding, earning the kids' admiration. Little does Punky realize Pierre LePelt is actually a poacher whose campaign is actually to continue hunting furs and pelts of the dwindling animal population.