We are currently in the twenty-first century. The 1900s were the twentieth century, 1800s the nineteenth century, etc.
What is the question? Or can you list the options to that if that is the question
<span>The first response is correct. The southern states accepted the terms of Reconstruction shortly after the Civil War ended. By doing so, they were able to re-join the other states and quickly begin to heal from the bloody skirmishes and battles that had taken place over the past decade.</span>