What did the government have to do with ww1 and with ww2?

In both wars, the governments of the world had to try to fix the what had been destroyed.

America, on the other hand, had little to no damage in ww1 but had plenty in ww2. They spent most of the time after ww1 partying and making the stock market crash. While after ww2, they tried to get communism out of the new countries.