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This has nothing to do with this US employmentThe Department of Commerce announced its affirmative preliminary determination in respect of Bombardier's alleged dumping under its countervailing duties (CVD) powers from the Smoot-Hawley Tariff Act of 1930, as amended [1][2]. The Tariff Act was passed "to protect American jobs and farmers from foreign competition" [2].
There is a secondary concern in national security, e.g. if a country's automotive sector is decimated by foreign competition then it can no longer build tanks. But the driving concern behind "trade wars," and certainly this administration's enforcement of them, is employment.
[1] http://enforcement.trade.gov/download/factsheets/factsheet-c...
[2] https://en.wikipedia.org/wiki/Smoot–Hawley_Tariff_Act#End_of...