Answer:
It decided that the national government was supreme, its sovereignty derived directly from the people, and thus the states could not lawfully secede from the Union.
State's rights vs national dominance were the main point of contention. States could not legitimately split from the Union since it was established that the national government was superior and that its sovereignty came directly from the people.
States' rights refer to the continuous conflict between the federal government and individual states in the United States over political power, as largely described in the Tenth Amendment, and whether the USA is a single country or a conglomeration of separate nations.
After the Civil War, the federal government gained increased control over important governmental decisions and public policy. Many of the foundational elements of the contemporary federal government were born during the Civil War and the Congresses that met during that time. The first national banking system was approved by Congress as well as the first government bond sale. To aid farmers, the Agriculture Department was established. States' rights were a major issue. The Southern states intended to assert their control over the federal government to get rid of regulations that they disagreed with, particularly those that restricted their ability to keep and transport slaves as they pleased.
Learn more about the civil war here:
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