Answer:
Gas
Machine Guns
Trenches
Explanation:
ww1 was all about using mustard gas and it was popularized before being banned after ww1 and ww1 was the first introduction to full auto machine guns similar to LMGs nowdays and trenches were created to prevent getting shot, gassed or sprayed down by enemies
Answer:
The Senate is composed of 100 Senators, 2 for each state
Explanation:
Its in the constitution.
It allowed Missouri to be a slave state.
I believe the answer you are looking for is Merchantilism. Let me know if I helped any.