Europe also got bombed to pieces, major cities had to be rebuilt anyway, and Eastern Europe didn't have the wealth that post WWII-America did, so trams were mor

Europe also got bombed to pieces, major cities had to be rebuilt anyway, and Eastern Europe didn't have the wealth that post WWII-America did, so trams were more an essential service than a nice-to-have thing. European cities also came into being before the car did, so their layout is often more streetcar friendly: Higher density, no room for six lane highways, etc.