How did judge taney counter Scott's argument?

Judge Roger Taney countered Dred Scott's argument by asserting that African Americans, whether free or enslaved, were not considered citizens under the U.S. Constitution and therefore had no right to sue in federal court. He further claimed that Congress lacked the authority to regulate slavery in the territories, declaring the Missouri Compromise unconstitutional. Taney's ruling emphasized the idea that property rights, including the rights of slaveholders, were paramount, ultimately denying Scott's claim to freedom.