I believe the estimate was around 75,000
The atomic bomb was the first nuclear weapon ever made during World war two and it was the first weapon that have been tested before Hiroshima was under attack.
During World War 2, and it was made by test reactors.
Which President? US or UK. Since US is the first country to use nuclear weapons, then I assume that you are asking who was the US president during world war two while nuclear testing? Answer: Truman.
Atomic/nuclear weapons
No. The first nuclear weapons were used in 1945 during the Second World War. These however were bombs (dropped from a plane) not missiles. The first successful nuclear explosion for military purposes was the Trinity test by the USA in 1945, more than 25 years after the end of the First World War.
Although the Germans during World War II were the first to come up with both the concept it never came to light. America was the first nation to make a nuclear weapon.
The first nuclear bombs were developed in the United States of America during the Second World War in 1939 under the order of President Franklin Roosevelt.
trinity was the code of the detonation of the nuclear deviceit was the first nuclear bomb in the world
The USS Nautilus (SSN-571) was the world's first operational nuclear submarine.
Dr. Klein was head of the team that designed Canada's first nuclear reactor during the 1940's. The reactor contributed to military inventions that were key in siding the Allies during the 2nd World War.
The United States during World War 2. The development is known as the Manhattan Project
During world war 2, the United States finished making them. They were first to have a nuclear bomb and the only ones to use it againts mankind.