Indeed, when you experience the public transportation system in the 1st World EU countries and Japan, the USA is decades behind them.

I think thinking of it this way only makes sense if commitment and desire to create good public transportation is somewhat comparable - which it's not. In the US (and a lot of Canada) there simply isn't any desire to properly invest in public transit. When public transit projects fail and a government is held accountable at the ballot box, the following government just slashes everything and washes their hands of it instead of trying to fix things. They're not behind in time, they're behind in commitment.