Urban areas developed subways, elevated trains, and streetcar systems because if all commuters rode in cars it would cause traffic jams and major traffic. It made it easier for people to move around in bigger cities.
Bad harvests maybe im pretty sure
In a unitary government the central government holds all the power. In a federal government the power is divided between the central government and lower levels of government (provinces or states). In a confederate government most of the power rests in the states.'
Hope this helps :)
Voices, thunderings
The reference you have in mind is from chapter 8 of the Revelation of Jesus Christ to John. Here's the section as quoted from the King James Version:
"Another angel came and stood at the altar, having a golden censer; and there was given unto him much incense, that he should offer it with the prayers of all saints upon the golden altar which was before the throne. And the smoke of the incense, which came with the prayers of the saints, ascended up before God out of the angel's hand. And the angel took the censer, and filled it with fire of the altar, and cast it into the earth: and there were voices, and thunderings, and lightnings, and an earthquake" (Revelation 8:3-5 KJV).
