The correct answer for 1 is new business techniques and improved technology
After world war 2, the United States did not have a ruined economy like most of Europe did and they started becoming the biggest manufacturer in the world because of high exporting. They had technology developed like television and radio and fridges and similar things and it enabled a huge economic boom that others could not compete with.
The correct answer for 2 is because it lacked diversity
The suburbia culture was based around the middle class families who started earning a lot and moving outside of the cities into suburbs. This more or less meant that communities were now consisting of white and well situated families that had their own behavior and cherished the ideal image of a family that was popular at the time
The correct answer for 3 is radio shows
Radios were extremely popular and widely used and many ideas could be played on the radio as a testing ground. If a thing became too popular, it would then be adapted into television comedy shows which eventually developed into the idea of sitcoms as we know them nowadays who had a huge boom.
The correct answer for 4 is when the quiz scandal was discovered
In the 1950s there was a huge scandal when it was found out that various quiz shows were rigging the competition and not making it fair by telling some of the competitors answers or similar things for various reasons. It was before legislature on rigging stuff like this was introduced and many quizzes stopped airing after the scandal
