the US is a federal republic and a constitutional representative democracy
They had beef about one of them not paying and they declared war.
Bleeding Kansas describes the period of repeated outbreaks of violent guerrilla warfare between pro-slavery and anti-slavery forces following the creation of the new territory of Kansas in 1854. In all, some 55 people were killed between 1855 and 1859
The Emancipation Proclamation only freed the slaves in the Confederate states, therefore encouraging them to rise up.
The correct answer is veto.
A veto is the ability of the president to reject a law. For example, if the Senate and House of Representatives pass a law they need the president to sign it. The president can refuse to sign it which results in a veto. Then the only way the law would be implemented into American society would be by having the Senate and House of Representatives vote on it again. If both houses vote this law into place with a 2/3rd vote, then this would become law without the presidents help. This process is known as an override.