>>212580998
You are. South Dakota is the only state without left-lane laws.
In all states it's a traffic violation to hold up traffic in any way, too.
https://www.goupstate.com/story/news/nation-world/2019/10/25/driving-in-left-lane-state-by-state-guide-to-when-its-legal-when-its-not/2447573007/