Chinese immigrants helped define birthright citizenship in the US

Cases involving Chinese immigrants from San Francisco reached the US Supreme Court and helped establish birthright citizenship, now under threat as America celebrates 250 years as a nation. Birthright citizenship is just one of the landmark legal victories won by 19th-century Chinese immigrants. Their court battles helped secure constitutional protections that remain at the center of today's debates over citizenship, due process and democracy. KQED's Cecilia Lei reports from San Francisco.