A catalytic converter is a device that uses a catalyst to convert three harmful compounds in car exhaust into harmless compounds. The three harmful compounds are: 1  Hydrocarbons (in the form of unburned gasoline).
Answers.comÂ® is making the world better one answer at a time. Slavery ended permanently in Louisiana in 1865. The end of slavery was a direct result of the passage of the Thirteenth Amendment to the Constitution.
The official end of slavery in the United States happened in stages. State laws in Northern states had begun the process in the late 18th century. In April 1862 the U.S. Congress passed & Lincoln signed a bill ending slavery in Washington D.C.