Why Has the US Maximum Pressure Against Iran Backfired

Since the dawn of the 1979 Islamic revolution, Iran has always been under the US sanction. After Donald Trump withdrew from the JCPOA in May 2018, the US started a maximum pressure campaign against Iran to force this country to negotiate over its missile program and influence in the West Asia region. How successful have American maximum pressure sanctions actually been Observe this video carefully to know why we believe the US maximum pressure has seriously backfired: