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The Democratic Party's sweeping victory in the 2026 U.S. midterm elections, dubbed a 'blue tsunami,' has triggered a global market selloff over fears of tighter AI and big tech regulations. On Nov. 5, the KOSPI plunged more than 5%, and on Nov. 6 it fell over 8% in early trade, triggering a circuit breaker and sidecar, before closing down more than 6% and barely holding above 5,000, according to KBS World. Business Korea reports the KOSPI closed below 5,400 on Nov. 5, and Asian semiconductor markets were hit by fears of a U.S. AI investment slowdown. Chosun Ilbo reports the Nasdaq lost a record 3,355 trillion won in market cap in a single day, and Korean retail investors who had piled into stocks on 'AI rosy outlooks' voiced complaints, with one major bank executive saying, 'The whole nation lost wealth through stocks.' Meanwhile, President Donald Trump, facing the blue tsunami, threatened tariffs of up to 300% on foreign companies that don't build factories in the U.S., according to Dong-A Ilbo.