The Bureau and the KKK were both created after the Civil War. The Bureau was created to help formerly enslaved people transition to freedom, while the KKK was created to terrorize and oppress Black people. The Black Codes were a set of laws passed in the Southern United States after the Civil War that restricted the rights of Black people. The Wade-Davis Bill was a piece of legislation that proposed to give the federal government more power over the Southern states during the Reconstruction era. The 14th Amendment to the US Constitution guaranteed equal protection under the law to all citizens, regardless of race. The Emancipation Proclamation was issued by President Abraham Lincoln in 1863 and declared that all enslaved people in the Confederate states were free.
The Black Codes were closely related to the Bureau and the KKK because they were all part of the effort to control Black people after the Civil War. The Black Codes restricted the rights of Black people in many ways, including preventing them from owning property, voting, and attending school. The Bureau was created to help Black people overcome these restrictions, while the KKK was created to enforce them.