Answer:
destruction or slaughter on a mass scale, especially caused by fire or nuclear war.
Explanation:
The Holocaust, also known as the Shoah, was the genocide of European Jews during World War II. Between 1941 and 1945, Nazi Germany and its collaborators systematically murdered some six million Jews across German-occupied Europe, around two-thirds of Europe's Jewish population.
Ulysses S. Grant did, I hope this helped.
The Government helped with railroad companies by lending them money for the material that they need and by lending them the material they need. That is how the Government helped railroad builders.