They developed the best army in the world at that time, and ruled by force. They had fine engineering, and built roads, cities, and outstanding buildings.
Robert E Lee and Gen Ulysses S. Grant met in the Wilmer McLean home at Appomattox Virginia at 1:00 PM to finalize the terms of surrender for the Confederate Army which effectively ended the US Civil War.
To become the Chair of a committee in Congress, you really just need to stay on the Committee for the longest and have your party win control of the House.