How does the increase in trade between canada and the united states affect manufacturing in the united states?

To understand how the trade between Canada and the United States affect manufacturing in the United States, we must look back in time. After World War II the manufacturing jobs helped build out the U.S. middle class, they not only created good paying jobs but also helped provide the people without college education a better life.

Unfortunately the trade between Canada and the United States has a strong role on the decline of manufacturing the jobs, therefore the manufacturing sector has been struggling with its preservation.

i think it's the cabinet