Answer: The Invention of the timer gear on fighter aircraft, the monoplane and more advanced aircraft such as fighter and bombers. the tank, the submarine, the machine gun, the dreadnought, the semi-auto rifle, chemical weapons, and the sub-machine gun. The tank, the submarine, the machine gun, semi-auto rifle, and the sub-machine gun are all still used today.
Explanation:
The answer is
B. to maintain its neutral status in the war between Britain and France
The north seemed to gain more of its goals. The balance of the senate was now with the free states . The major victory for the south was the Fugitive Slave Law (FSL). In the end the north refused to enforce it.
The civil war ended slavery.
Well i am really not good on history but i think it is between b and d
