in no particular order
* atom bomb (as someone said, it changed the distribution of power)
* numerous healthcare advances (prolonged life expectancy considerably, boom in world population)
* WWI, WWII (it taught europe to behave, and caused it to turn towards prosperity)
* 1973 oil embargo (the west's inflated ego was popped like bubble gum. it was reminded how vulnerable it really was)
* fall of USSR, and the end of the cold war (people stopped worrying about nuclear armageddon... at least for a short while)
* the development of Ford's mass production techniques (made cars affordable to everyone. owning a car became a normal thing for everyone, not just the stinken rich. the introduction of cars into American Life (and therefore Western life))
* decolonialization (created nationalist 3rd-world gov'ts all over the world, angry and bitter with their former colonizers)
* internet (e-commerce, online dating, new culture and ways to communicate, etc.)
* pearl harbour (the US changed its isolationist policy and from now took a more active role in influencing foreign governments - to put it mildly)
* the Balfour Declaration (which called for the creation of Israel, in 1917)
* atom bomb (as someone said, it changed the distribution of power)
* numerous healthcare advances (prolonged life expectancy considerably, boom in world population)
* WWI, WWII (it taught europe to behave, and caused it to turn towards prosperity)
* 1973 oil embargo (the west's inflated ego was popped like bubble gum. it was reminded how vulnerable it really was)
* fall of USSR, and the end of the cold war (people stopped worrying about nuclear armageddon... at least for a short while)
* the development of Ford's mass production techniques (made cars affordable to everyone. owning a car became a normal thing for everyone, not just the stinken rich. the introduction of cars into American Life (and therefore Western life))
* decolonialization (created nationalist 3rd-world gov'ts all over the world, angry and bitter with their former colonizers)
* internet (e-commerce, online dating, new culture and ways to communicate, etc.)
* pearl harbour (the US changed its isolationist policy and from now took a more active role in influencing foreign governments - to put it mildly)
* the Balfour Declaration (which called for the creation of Israel, in 1917)