[coroutines]

1) Global trade was not as established prior to WWII - there is a market incentive to maintain alliances. We don't even have the production means to make everything we need anymore - we're too inter-dependent.

2) Facebook and Snapchat and other social venues made possible by the Internet make it hard to sew mutual distrust among the nations of the world. If the Cold War happened today we'd see the propaganda from both sides on Twitter - I think it would be harder to mislead people with 2+ perspectives.

Every generation does think it can do better than the last - but I personally think there are a few major differences to set us apart. :>