it didnt apply to border staates but the answer to your test question is A to free all free all slaves.
Answer: B. keep the balance of power in the Senate between the slave states and free states.
Further detail:
The Missouri Compromise (1820) admitted Missouri into the Union as a slave state with Maine being added at the same time to keep the balance of slave and free states equal. It also prohibited any future slave states north of the latitude line 36 1/2 degrees north of the equator in territories of the Louisiana Purchase, with the exception of Missouri (north of that line) being admitted as a slave state.
The correct option is the number 3
From the beginning of the war, and despite the policy of isolationism, the USA helped England with armaments, food and financial assistance. When the country entered the war all its industry changed as well as its society and lifestyle. Young men went to war and women took their places in working life. The industry transformed completely and went from producing consumer goods to producing armaments and military supplies to face the great war.
Spain and France were focused on trading, gold and religions. England was focused on finding new lands to live on and to grow on. They didn’t have much in common as they all tried to take away from each one another, Spain had there territory and France went and trades with English colonies. They didn’t want anything to do with one another.
“Answer transferred into different words from the web”
It allowed for more and faster production with less production cost, because they didn't pay workers or do the work themselves.