(This only relates to the connection of 1 and 2) my theory is that something happened (disease,weather problems,Etc,etc) in the first town and they had to make a new town but they didn't have enough money so they for contributions to build it and only the people who (or wasn't sick) contributed could go but not everybody could (which explains the "passage people") so when it was finished  they left but a carrier went with them spreading the disease there also.