when sulfur dioxide sulfur & nitrogen oxides are released into the air.
During World War I, Germany had been blockaded, so they didn't have the fertilizer for their crops and the food to survive, which then led to deaths. After the war, Germany was just really inefficient, and they had major problems. These problems then led to Hitler becoming the tyrant of Germany, which then led to World War II because he blamed all of the problems on the Jewish people, which then made even more problems.
His expedition lasted 2 years.
People would retaliate against other abolitionist leaders. Southern states began to form militias, which late became the Army of the Confederacy.