The First Seminole War began with General Andrew Jackson's excursions into West Florida and Spanish Florida against the Seminoles after the conclusion of the War of 1812. The governments of Great Britain and Spain both expressed outrage over the invasion.
The Civil War occurred from the years of 1861 to 1865. If we are talking about the reelection in 1864, then it means there was only one year left in the Civil War. Therefore, the Civil War was close to ending.
Article V of the Articles of Confederation reflect representative government by granting to the states the right of having one vote and the opportunity to raise their voices in "determining questions in the United States" whenever the Congress assembles.
In short, states' rights, in this context, are the powers entitled to states rather than to the national unit alone, meaning that each state is sovereign and have jurisdiction over its affairs.