I think that, with the right sequence of PoDs, Technocracy, Inc. could reach power in America, though it would be a bit of a stretch. As I see it, the key components of such a TL would be: 1) have Howard Scott not blow his New York speech; 2) eliminate FDR; 3) have any attempt at coping with the Great Depression without FDR fail; 4) have the political and economic situation deteriorate enough that American elites become seriously worried about the possibility of left- or right-wing insurrection. At that point, Technocracy can position itself as a revolution that the elites think they can control. All in all, an unlikely sequence of events, but stranger things have happened in real life.
That said, a North American Technate will probably go down in history next to Stalin's Russia and Mao's China.