Study up on the tariffs that went into effect in the late twenties/early thirties(or thereabout) and you can come to the same conclusion my school of thought has brought me to. And, the "Great Depression" isn't the only incident in time that severe regulation and too high taxation has promulgated. Many recessions have been caused as well.
Woody
It's also worth noting that the United States relied very heavily on tariffs through most of its history going all the way back to the revolutionary war years. It was only post WW2 that we started to move away from this.