The U.S. Congress, under the control of the Radical Republicans, passed the Military Reconstruction Act of 1867 on March 7, in spite of President Johnson's veto. This act sought to rebuild the governments of the southern states using the governments of the northern states as examples. It was also implemented to ensure that the civil rights of the free blacks in the South by requiring the states in the South to include the rights of free blacks in their constitutions!!:)
Andrew Jackson was the president after Lincoln. He was Lincoln's VP.
Austria-Hungary had control over Serbia, but Serbia did not like that fact. A group of terrorist Serbians called "The Black Hand" assassinated Archduke Ferdinand of Austria-Hungary to assert their frustration over them. This started opening up some of the secret alliances, and Austria-hungary and Serbia went to war. Germany was allied with Austria-hungary at the time, so they joined the fight and declared war on Russia, one of Serbia's allies. Then Germany declared war on France, who had England backing them up. Finally, Germany sank of the United States's ships (actually multiple), thus causing almost all major countries to go at war with one another.