People feared Catholics would rule the world with Smith as President leading to Hoover's election. This reflected rural vs. urban, nativism vs. foreigners, "wets" vs. "dries," Catholics vs. Protestants, and tradition vs. modern values. Hope this helped!
Food surplus gave more of the population time to develop and innovate new ideas
If you’re referring to the order in which they occurred, it’s 2 then 1 then 3 then 4