That's definitely the truth. The election of President Lincoln caused North Carolina to secede from the Union =)
It would be Japan, since after the bombs dropped US forced the Emperor to stepped down.
He was able to utilize interchangeable parts to make is plows more efficient. He started using iorn as his material for building plows. Since iron was heavier it was easier to dig into the soil.
In the United States, both the President and the State Department are responsible for foreign policy, although most of these powers are delegated to the Secretary of States.