What was one outcome of the Civil War?

The Civil War, which took place from 1861 to 1865, was primarily fought over the issues of slavery and states' rights. One significant outcome of the war was the abolition of slavery in the United States. This was formalized with the passage of the 13th Amendment to the Constitution in 1865, which explicitly prohibited slavery and involuntary servitude. This monumental change not only liberated millions of enslaved African Americans but also fundamentally transformed American society and laid the groundwork for subsequent civil rights advancements.

The other options, while important in their own right, are not directly related to outcomes of the Civil War. The expansion of U.S. territories occurred prior to the war and was influenced by different factors, the establishment of the United Nations occurred after World War II, and the creation of the Interstate Highway System happened much later, in the 1950s, as part of a post-war infrastructure initiative. Thus, the end of slavery stands out as a direct and consequential result of the Civil War.