Polarized receptacles were mandated in the US by the National Electric Code in 1962. I feel like during the 1990s every electronic device you bought had a pola

Polarized receptacles were mandated in the US by the National Electric Code in 1962. I feel like during the 1990s every electronic device you bought had a polarized plug, but then with the advent of smartphones circa 2007-2008 and then the flood of aftermarket chargers a few years later, we suddenly went backwards to non-polarized plugs.