This is a bit tricky, but in general, it is climate change that is the source of the greatest disagreement among American politicians, because some people still think it doesn't exist.
Johnson served from 1865 to 1869, he was the first American president to be impeached.
The Amazon river is longer than the Nile.
After the Civil War, the federal government was very wary of the southern states that had so recently rebelled. In came an era of Reconstruction, in which the federal government forced the South to give equal opporunities to blacks. Of course this didn't last long, and in came Jim Crow laws almost immediately after the Civil War. The South's economic development staggered.
