1. The bombs were not yet ready. The Manhattan Project, the top-secret research and development effort that produced the atomic bombs, did not begin until 1942. By the time the first bombs were ready for use in July 1945, Germany had already surrendered.
2. The US did not want to antagonize the Soviet Union. The Soviet Union was an ally of the US during World War II, but the two countries had a tense relationship. The US feared that using atomic bombs on Germany would anger the Soviets and could lead to a nuclear arms race.
3. The US wanted to avoid civilian casualties. The atomic bombs that were dropped on Hiroshima and Nagasaki killed hundreds of thousands of people, mostly civilians. The US did not want to cause similar devastation in Germany.
4. The US wanted to avoid destroying Germany's industrial infrastructure. Germany's industrial infrastructure was essential to the war effort. The US did not want to destroy this infrastructure, as it would make it more difficult to rebuild Europe after the war.
In conclusion, there were a number of reasons why the US did not use atomic bombs on Germany during World War II. These reasons included the fact that the bombs were not yet ready, the US did not want to antagonize the Soviet Union, the US wanted to avoid civilian casualties, and the US wanted to avoid destroying Germany's industrial infrastructure.