The senate leader is the president pro tempore and house leader is the leader of the house. If both president and Vice President should die, the speaker of the house becomes president. The senate confirms cabinet secretaries, justices and ambassadors
In that long conversation between John and the Mond. John gives him a number of arguments about why religion is necessary. John openly expresses his aversion to the usual simple life in a society where only science abolishes all frustrations. Mond admits doubts about the "Society of Universal Happiness", the more that he was once gifted, physicist. Especially when this society is actually under the prohibition of religion.
I think E ww1 but correct me if I’m wrong :)