South Dakota v. Wayfair, Inc. – the US Supreme Court case that decided American States can impose taxes on sales without the vendor having a physical presence (viz: internet sales)
From Wikipedia The South Dakota case This is the decision which overturned Quill Corp. v. North Dakota (1992), which, in turn, had held that the ‘Dormant Commerce Clause’ barred American States, from compelling retailers, to collect ‘sales’ or ‘use’ taxes, in connection with mail order or Internet sales, made to their residents, unless those retailers had…

