WASHINGTON (AP) — Oprah Winfrey is giving $12 million to a museum being built on Washington's National Mall that will document African-American history, officials said Tuesday.

The media mogul and former talk-show host previously gave $1 million to the National Museum of African American History and Culture, and the museum says her $13 million total contribution is its largest to date. As a result, the museum's 350-seat theater will be named after Winfrey, who is also a member of its advisory council.

Construction on the $500 million museum began in early 2012. When it's finished in 2015, the museum will be the 19th Smithsonian museum. The U.S. government is providing half of the funding. To date, about $140 million has been raised in private funds....