B. Security and national defense
C. Expansion of democracy and human rights
15 slave and 15 free states.
It is A. city blocks laid out in a grid pattern and C. a standardized system of weights and measures.
It showed everyone inventions were imporant, it also made work so much easier instead of having to carry things, you could just use the pulley which was less strain on the human body and less chance someone could get hurt.
