What traditions and institutions were destroyed by the Civil War?

Numerous traditions and institutions were destroyed by the US Civil War. The most important, of course, was the institution of slavery. It is important to note that Abraham Lincoln's Emancipation Proclamation, which he issued during the war, did not free all slaves; it only freed those held in states that were rebelling against the Union. Thus, the Proclamation freed about 3.1 million out of the 4 million slaves in the United States, but it did not affect slaves in the border states of Missouri, Kentucky, Delaware, and Maryland.

However, just after the war, all slavery was abolished in the United States through what became known as the "Reconstruction Amendments": the Thirteenth, Fourteenth, and Fifteenth Amendments to the Constitution. The Thirteenth Amendment abolished slavery and involuntary servitude throughout the country, unless the servitude was imposed as punishment for a crime. The Fourteenth Amendment gave American citizenship to everyone born and naturalized in the United States, including African Americans. The Fifteenth Amendment allowed citizens to vote regardless of their race, color, or previous condition of servitude. These amendments certainly destroyed, at least in theory, traditions of inequality for Black people that had long existed in America.

The Reconstruction Acts of 1867 and 1868 temporarily destroyed the institutions of government that had existed in the Southern states and divided them into five military districts. To reestablish their statehood, the Southern states had to draft new constitutions, which were subject to approval by the US Congress.

The original state of Virginia was transformed by the Civil War when the people of West Virginia aligned with the Union and the rest of Virginia aligned with the Confederacy. West Virginia became a separate state on June 20, 1863.

Another institution that was destroyed or radically diminished by the Civil War was the powerful agricultural economy of the South. In the aftermath of the war, industrialization became the driving force of the US economy.
http://civilwarmuseum.weebly.com/long-term-effects-of-the-civil-war.html

https://www.history.com/topics/american-civil-war/reconstruction