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In 2010, an explosion on an oil rig in the Gulf of Mexico resulted in 11 deaths and the largest oil spill in U.S. history.
Responders applied chemical dispersants to the surface oil slick—to break oil into smaller droplets.
In 2018, the President imposed tariffs on many steel and aluminum imports, and told the Department of Commerce to allow companies to request relief from paying these tariffs in certain circumstances.
In 2020, Commerce made changes to its procedures for deciding such "tariff exclusion requests.