Answer:
I believe that "a biography of John F. Kennedy" and "a letter written by Thomas Jefferson to the British monarch" go in primary and the other two go in secondary.
It allowed for better transportation of goods and recourses. Not sure if correct though.
Answer: Where was the area wwhere gladiators fought
The Coliseum
Answer:
4 I think not positively sure about it
Electric streetlights, your welcome .