Before and during the Civil War, Americans disagreed over the role of federal and state governments, primarily due to differing interpretations of the Constitution and conflicting interests between the Northern and Southern states.

1. The issue of states' rights: Southern states, particularly those that supported slavery, argued for strong states' rights. They believed that the federal government's power should be limited to what was explicitly stated in the Constitution, and that states should have the right to nullify or disregard federal laws they considered unconstitutional. This was driven by their desire to protect and expand the institution of slavery.

2. The tariff controversy: The North favored protective tariffs to foster industrial growth and to protect their industries from foreign competition. However, the South, which relied heavily on agricultural exports, saw these tariffs as unfavorable, as they hurt their ability to trade with other countries. The South believed that states should have the power to nullify or ignore these federal tariffs.

3. Internal improvements: Disputes arose over whether the federal government or the states should fund and oversee internal improvements such as roads, canals, and railroads. Northern industrialists favored federal funding to promote economic growth, while the South felt that such investments primarily benefited the North and questioned the constitutionality of federal involvement in these matters.

4. Popular sovereignty: The concept of popular sovereignty, which allowed individual territories to decide on the issue of slavery, further intensified the debate. The South argued that states should have the right to determine their own laws regarding slavery, while some in the North opposed the expansion of slavery into new territories and advocated for the federal government to take a stronger stance against it.

These disagreements ultimately became irreconcilable, leading to the secession of several Southern states and the start of the Civil War in 1861 summarize this

Overall, the disagreements centered around the balance of power between the federal and state governments, with the South advocating for strong states' rights and limited federal power. The Southern states' desire to protect and expand the institution of slavery further fueled the tensions. Disputes also arose over economic issues, such as protective tariffs and the funding of internal improvements, with the North and South advocating for different approaches. The concept of popular sovereignty, allowing individual territories to decide on the issue of slavery, further intensified the debate. These disagreements eventually led to the secession of Southern states and the start of the Civil War.