Your answer is the first one. Domestic Servant, Skilled Trades, and field workers.
FDR had polio in his childhood, leaving him paralyzed.
A massive topic for this could be oil. You could talk about OPEC and the different types of technologies involved
Duing the time of the Roman emperors, the term bread and circuses referred to C. free bread and entertainment for the poor. Many leaders at the time understood that in order to prevent the poor from rising up and attacking the elite lifestyle of the ruling class, they must be kept fed and entertained, which is why there are so many coliseums.
