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@DFP
Because BMX's originally had one piece cranks (because they are american) with chain rings all with tooth counts based on standard 16tooth freewheels.
When newer improved cranks were made, they stuck to the same chainring and freewheels.
It was only in the late 90's or therabouts, that this started to change. First with smaller screw on freewheels. Then eventually a cassette type system.