What was the main accomplishment of the manhattan project during world war ii?

The development of the atomic bomb

Explanation:

The Manhattan Project was a research and development project carried out during the Second World War that produced the first nuclear weapons, led by the United States with the support of the United Kingdom and Canada. From 1942 to 1946 the project was under the direction of Major General Leslie Groves of the Army Corps of Engineers of the United States, while the nuclear physicist Robert Oppenheimer was the director of the Los Alamos Laboratory in which the nuclear bombs were designed .

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.