I think the answer should be B
Beyond abolishing slavery in the United States, the Civil war was a pivotal event in American history for a number of reasons. One major importance of the war was that the Union retained its territorial integrity and the South was not able to secede from the Union or defeat the Northern forces. Also as a result of the war the Northern States were able to assert political dominance and a degree or retribution through the reconstruction efforts.
The main way in which geographic and economic differences between regions led to increased sectionalism in the US was that the South was entirely agrarian and depended heavily on slavery, while the North despised the institution of slavery. This eventually led to the Civil War.
The American Revolution was principally caused by colonial opposition to British attempts to impose greater control over the colonies and to make them repay the crown for its defense of them during the French and Indian War (1754–63). ... Learn about the Boston Tea Party, the colonists' radical response to a tax on tea.
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I'd say d. The religious freedoms because of,
"Traditionally, Isabella has been regarded as the living symbol of the religious awakening in Spain, but an examination of the letters exchanged between the king and the queen shows that they acted in perfect accord, moved by the same fanatical urge."
