Why did the Nazis never use Chemical or Biological weapons in WWII in combat? Ok

They feared that there enemies would retaliate with their own chemical/biological weapons against the Nazis.

Explanation:

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

stewards ice box was the purchase of alaska from russia and it was called that because people thought it was not a good idea to purchase alaska