Answer:
"In April 1846, Dred and Harriet filed separate lawsuits for freedom in the St. Louis Circuit Court against Irene Emerson based on two Missouri statutes. One statute allowed any person of any color to sue for wrongful enslavement. The other stated that any person taken to a free territory automatically became free and could not be re-enslaved upon returning to a slave state.
Neither Dred nor Harriet Scott could read or write, and needed both logistical and financial support to plead their case. They received it from their church, abolitionists and an unlikely source, the Blow family who had once owned them.
Since Dred and Harriet Scott had lived in Illinois and the Wisconsin Territory — both free domains — they hoped they had a persuasive case. When they went to trial on June 30, 1847, however, the court ruled against them on a technicality and the judge granted a retrial.
The Scott’s went to trial again in January 1850 and won their freedom. Irene appealed the case to the Missouri Supreme Court which combined Dred and Harriet’s cases and reversed the lower court’s decision in 1852, making Dred Scott and his family slaves again.
In November 1853, Scott filed a federal lawsuit with the United States Circuit Court for the District of Missouri. By this time, Irene had transferred Scott and his family to her brother, John Sanford (although it was determined later that she retained ownership). On May 15, 1854, the federal court heard Dred Scott v. Sanford and ruled against Scott, holding him and his family in slavery.
In December 1854, Scott appealed his case to the United States Supreme Court. The trial began on February 11, 1856. By this time, the case had gained notoriety and Scott received support from many abolitionists, including powerful politicians and high-profile attorneys. But on March 6, 1857, in the infamous Dred Scott decision, Scott lost his fight for freedom again...... By the time the U.S. Supreme Court handed down its Dred Scott decision, Irene had married her second husband, Calvin Chaffee, a U.S. congressman and abolitionist. Upset upon learning his wife still owned the most infamous slave of the time, he sold Scott and his family to Taylor Blow, the son of Peter Blow, Scott’s original owner.
Taylor freed Scott and his family on May 26, 1857. Scott found work as a porter in a St. Louis hotel, but didn’t live long as a free man. At about 59 years of age, Scott died from tuberculosis on September 17, 1858."
Explanation:
Source: https://www.history.com/topics/black-history/dred-scott-case