<span>It's a metaphor, darling. A nursery (whether it's a plant nursery or a nursery school) is a place where small plants or human beings are carefully nutured so that they can grow. "He" (whoever this mysterious "he" is that you're referring to) is asserting that factories are places where bad things like "disease and vice" can similarly grow and flourish.</span>
A. Better machinery as industrial revolution took course between 1820- 1840
American people generally believe that the ideals of the founding fathers are the best ideals because of things such as democracy, unalienable rights, the constitution with its amendments, and similar things. Whenever someone would show up who would claim otherwise that person would be accused of being a traitor or a spy or something similar. This was especially important during the red scare when they tried to fight communists in the US more than anything else.
A massive topic for this could be oil. You could talk about OPEC and the different types of technologies involved
