in the last century, from the start of commercial air travel in 1920 to the rise of smartphones thanks to high speed internet, i'd say those two roll outs probably had the biggest effect on the world as a whole.
connecting us, both in very different ways
everything else is practically secondary to those two things, flight and the net. at least when it comes to "technology"
Remember the Carousel of Progress was always meant to spotlight how technology improves our lives, which is why it initially focused on things like household appliances or the lightbulb... (stuff a sponsor could promote at a worlds fair pavilion or theme park, ya know)