In 1857: Supreme Courts Dred Scott decision permitted slavery in all WEstern territories, invalidating the ________ of 1820, Sandford, 60 U.S. 393 (1856) In a decision that later was nullified by the Thirteenth and Fourteenth Amendments, the Supreme Court held that former slaves did not have standing in federal courts because they lacked U.S. citizenship, even after they were freed.