Which conflict was mainly about states' rights and slavery issues?

The Civil War was primarily centered around the issues of states' rights and slavery, which were deeply intertwined in the context of American society during the 19th century. Southern states advocated for greater autonomy, wanting the power to make their own decisions regarding the legality of slavery without interference from the federal government. This conflict reached a boiling point as the northern states, which were generally opposed to the expansion of slavery into new territories, increasingly challenged the legitimacy of slavery as an institution.

The war was sparked by these fundamental disagreements over the future direction of the United States – whether it would expand slavery into the western territories or whether those territories would be free. The fight over states' rights played a significant role in this narrative, where southern states felt that their rights were being threatened by federal legislation aimed at curbing the spread of slavery and promoting abolition.

Other conflicts listed, like the War of 1812, the Mexican-American War, and the Spanish-American War, had different focal points. The War of 1812 was primarily about maritime rights and trade disputes, while the Mexican-American War was influenced by the desire for territorial expansion and manifest destiny but not specifically about slavery and states' rights. The Spanish-American War largely revolved around imperial ambitions and the liberation of