In the annals of Supreme Court decisions, the public likely remembers what justices wrote for the court in famous cases, such as the Brown v. Board of Education ruling that outlawed racial segregation in public schools.

Or perhaps the public remembers great dissenting opinions that display foresight and speak across the ages. Justice John Marshall Harlan’s dissent in the 1896 Plessy v. Ferguson case, which legalized racial segregation, is a shining example.

But Supreme Court scholars and the public alike seldom pay much attention to concurring opinions, in which a justice expounds on the views of their colleagues in the majority. Some legal experts have denigrated concurring opinions as “the worst form of legal clutter… that are, usually, better left unwritten.”

On June 30, 2026, in the Trump v. Barbara ruling, Justice Ketanji Brown Jackson showed how wrong that view can be when she delivered a monumental concurring opinion in the birthright citizenship case.

Chief Justice John Roberts wrote the majority opinion, ruling that the 14th Amendment guarantees automatic citizenship to virtually everyone born on U.S. soil. The decision invalidated President Donald Trump’s executive order that sought to deny citizenship to children born to foreign parents who are unlawfully in the United States.

Jackson, however, used her concurrence to go far beyond that and offer a new understanding of the origins of the 14th Amendment’s guarantee of birthright citizenship and its promise of equal treatment. She did so while emphasizing the singular contributions of Black Americans to that endeavor.

Along the way, Jackson criticized Justice Clarence Thomas and the court’s dominant originalist jurisprudence – centered on interpreting the Constitution based on how it was understood when it was adopted – for distorting the historical record. Jackson has previously signaled that a responsible use of history requires........

© The Conversation