Negative effects that the Manhattan Project had was giving other countries ways to make the same atomic weapons that the United States did. This may have not been a current effect at the time, but anyone can make these weapons and use them on the United States if they wanted to. We would not have many ways to stop this from happening. Another negative outcome would be the amounts of money and people that were needed for the project. This had a big effect because certain cities such as a town called Oak Ridge were special built for the project itself. This is a negative outcome because over two billion dollars were spent and 130,000 people were used just to beat the nazi. While it did end okay, there were some negative outcomes.
