In light of the foregoing, Elonis’s conviction cannot stand. The jury was instructed that the Government need prove only that a reasonable person would regard Elonis’s communications as threats, and that was error. Federal criminal liability generally does not turn solely on the results of an act without considering the defendant’s mental state. That understanding “took deep and early root in American soil” and Congress left it intact here: Under Section 875(c), “wrongdoing must be conscious to be criminal.” Morissette, 342 U. S., at 252.