obviously the computer.
Trade, shipping, finance, communication, it's all computer-enhanced. Globalization without computers wouldn't exist. Globalization actually changed the world. Science without computers wouldn't have come this far either.
The car just changed parts of the urban landscape in the first world and some developing countries and created a new lifestyle in certain areas but it's just a cheap horse and buggy really. They're an incremental step in affordability of private mobility, and never became critical in the big cities that lead the world anyway. London, New york, etc., would they be different without cars? They existed as economic centres before mass adoption of cars and didn't cease to be because of the car, and dense non-car dependent cities still lead the world and are where the economic growth happens.
The suburbs is just what happens when a mansion out of the city + buggy and horse becomes something most people can afford and not just a few noblemen and merchants of a city. There's nothing revolutionary about it.