How did the Dred Scott decision affect free African Americans?

In essence, the decision argued that as a slave Scott was not a citizen and could not sue in a federal court ... Taney also stated that Congress had no power to exclude slavery from the territories (thus invalidating the Missouri Compromise [1820]) and that African Americans could never become U. S. citizens

In essence, the choice argued that as a slave Scott wasn't a citizen and will not sue during a judicature ... Taney also stated that Congress had no power to exclude slavery from the territories (thus invalidating the Missouri Compromise [1820]) which African Americans could never become U. S. citizens.