For nearly 50 years, America failed to build a new aluminum smelter—until now. A major new smelter in Oklahoma marks the return of U.S. aluminum production, driven by President Trump’s tariffs and strict enforcement. The episode explains why aluminum is critical to national security, how Biden-era exemptions weakened the industry, and how Trump’s renewed tariffs, closed loopholes, and tough trade policy are bringing investment, jobs, and industrial strength back home.