Which of the following events was a significant result of the Civil War?

The Reconstruction Era was a significant result of the Civil War as it marked a crucial period aimed at addressing the challenges that emerged following the war. This era, which lasted from 1865 to 1877, focused on the reintegration of the Southern states that had seceded from the Union and the transformation of Southern society, particularly regarding the legal status and rights of newly freed African Americans.

During Reconstruction, critical amendments to the Constitution were enacted, including the 13th Amendment, which abolished slavery, the 14th Amendment, which granted citizenship and equal protection under the law, and the 15th Amendment, which prohibited denying the right to vote based on race. The federal government's role in ensuring civil rights and rebuilding the South was also a defining feature of this period, with efforts to rebuild infrastructure and establish social and political systems that would provide greater equity.

In contrast, the other events listed did not directly result from the Civil War. The Louisiana Purchase took place in 1803, long before the Civil War. The founding of the United Nations occurred in 1945, after World War II, and the signing of the Treaty of Paris refers to treaties that ended wars involving the United States, notably the American Revolutionary War and the Spanish