Answer:
Enabled the development of an atomic weapon based on the the theories of German scientists involving energy and matter is the correct answer.
Explanation:
The project that was started to develop atomic weapons during the second world war in US is known as project Manhattan. The project began in 1939 with the support of president Franklin D. Roosevelt. The project was kept secret and not even the vice-president Truman was informed about it. It was only after death of FDR that Truman was informed and given reports about this project. The theories and formulas such as Einstein's mass energy equation was used in the construction of atomic bomb. The scientists working on Manhattan project successfully tested the atomic bomb on July 16, 1945. The first bomb was dropped over Hiroshima on August 6, 1945.
Political changes are perhaps the most common way to enact change in a nation, because these changes almost always bring about social and economic changes.
To start the us policy of containment was made because of the fear of communism spreading. An example of containment is when Russia sent nuclear missiles to cuba which in turn created the Cuban missile crisis, the us then set up a "quarantine" around northern cuba to protect the us. Russia later took the missiles back and tensions fell. Another example is the situation in Berlin, West Berlin was communist, East Berlin was democratic, the communist vision eventually fell with the Berlin wall which promoted democracy. The us also gave billons of dollars to Europe to promote democratic growth. The quarantine is basically against communism and promoting a democratic style.
Cliffs can collapse because of the weather naturally eroding it. Also when water is constantly crashing against them, it can erode the layers of the cliff. It can also happen in a mud slide when the rain makes the soil extremely wet causing the rock to fall. Also in a rock slide when a piece of rock breaks off from the entire cliff.
