President Obama has decided to nominate the federal appeals judge Sonia Sotomayor to the Supreme Court, choosing a daughter of Puerto Rican parents raised in Bronx public housing projects to become the nation’s first Hispanic justice, officials said Tuesday.

Judge Sotomayor, 54, who has served for more than a decade on the 2nd Circuit Court of Appeals based in New York City, would become the nation’s 111th justice, replacing David H. Souter, who is retiring after 19 years on the bench. Although Justice Souter was appointed by the first President George Bush, he became a mainstay of the liberal faction on the court and so his replacement by Judge Sotomayor likely would not shift the overall balance of power.