The National Museum of African American History and Culture (NMAAHC), colloquially known as the Blacksonian, is a Smithsonian Institution museum located on the National Mall in Washington, D.C., in the United States. It was established in 2003 and opened its permanent home in 2016 with a ceremony led by President Barack Obama.

Early efforts to establish a federally owned museum featuring African-American history and culture can be traced to 1915 and the National Memorial Association, although the modern push for such an organization did not begin until the 1970s. After years of little success, a legislative push began in 1988 that led to authorization of the museum in 2003. A site was selected in 2006, and a design submitted by Freelon Group/Adjaye Associates/Davis Brody Bond was chosen in 2009. Construction began in 2012 and was completed in 2016.

The NMAAHC is the world's largest museum dedicated to African-American history and culture. In 2022 it welcomed 1,092,552 visitors, and was the second–most visited Smithsonian Museum and eighth–most visited museum in the United States. The museum has more than 40,000 objects in its collection, although only about 3,500 items are on display. The , 10-story building (five above and five below ground) and its exhibits have won critical praise.

History Early efforts The concept of a national museum dedicated to African-American history and culture can be traced back to the second decade of the 20th century. In 1915, African-American veterans of the Union Army met at the Nineteenth Street Baptist Church in Washington, D.C., for a reunion and parade. Frustrated with the racial discrimination they still faced, the veterans formed a committee to build a memorial to various African-American achievements. Their efforts paid off in 1929, when President Herbert Hoover appointed Mary Church Terrell, Mary McLeod Bethune, and 10 others to a commission charged with building a "National Memorial Building" showcasing African-American achievements in the arts and sciences. But Congress did not back the project, and private fundraising also failed. Although proposals for an African-American history and culture museum would be floated in Congress for the next 40 years, none gained more than minimal support.

Proposals for a museum began circulating again in Congress in the early 1970s. In 1981, Congress approved a federal charter for a National Afro-American Museum in Wilberforce, Ohio. The museum, built and funded with private money, opened in 1987. In the early 1980s, Tom Mack (the African-American chairman of Tourmobile, a tourist bus company) founded the National Council of Education and Economic Development (NCEED). Mack's intention was to use the non-profit group to advance his ideas about economic development, education, and the arts in the black community. Emboldened by Congress's action in 1981, Mack began using the NCEED to press for a stand-alone African-American museum in D.C. in 1985. Mack did not collaborate with other black-led cultural foundations that were working to improve the representation of African Americans by Smithsonian and other federal institutions. Mack contacted Representative Mickey Leland about his idea for a national museum focusing on African Americans, and won his support for federal legislation in 1985. Leland sponsored a non-binding resolution (H.R. 666) advocating an African-American museum on the National Mall, which passed the House of Representatives in 1986. The congressional attention motivated the Smithsonian to improve its presentation of African-American history. In 1987, the National Museum of American History sponsored a major exhibit, "Field to Factory", which focused on the black diaspora out of the Deep South in the 1950s.

"Field to Factory" encouraged Mack to continue pursuing a museum. In 1987 and 1988, NCEED began lining up support among black members of Congress for legislation that would establish an independent African-American national history museum in Washington, D.C. But NCEED ran into opposition from the African American Museum Association (AAMA), an umbrella group that represented small local African-American art, cultural, and history museums across the United States. John Kinard, president of the AAMA and co-founder of the Anacostia Community Museum (which became part of the Smithsonian in 1967), opposed NCEED's effort. Kinard argued that a national museum would consume donor dollars and out-bid local museums for artifacts and trained staff. Kinard and the AAMA instead advocated that Congress establish a $50 million fund to create a national foundation to support local black history museums as a means of mitigating these problems. Others, pointing to the Smithsonian's long history of discrimination against black employees, questioned whether the white-dominated Smithsonian could properly administer an African-American history museum. Lastly, many local African-American museums worried that they would be forced to become adjuncts of the proposed Smithsonian museum. These institutions had fought for decades for political, financial, and academic independence from white-dominated, sometimes racist local governments. Now they feared losing that hard-won independence.

In 1988, Rep. John Lewis and Rep. Leland introduced legislation for a stand-alone African-American history museum within the Smithsonian Institution. But the bill faced significant opposition in Congress due to its cost. Supporters of the African-American museum tried to salvage the proposal by suggesting that the Native Indian museum (then moving through Congress) and African-American museum share the same space. But the compromise did not work and the bill died.

Lewis and Leland introduced another bill in 1989. Once more, cost considerations killed the bill. The Smithsonian Institution, however, was moving toward support for a museum. In 1988, an ad hoc group of African-American scholars—most from within the Smithsonian, but some from other museums as well—began debating what an African-American history museum might look like. While the group discussed the issue informally, Smithsonian Secretary Robert McCormick Adams, Jr. publicly suggested in October 1989 that "just a wing" of the National Museum of American History should be devoted to black culture, a pronouncement that generated extensive controversy. The discussions by the ad hoc group prompted the Smithsonian to take a more formal approach to the idea of an African-American heritage museum. In December 1989 the Smithsonian hired nationally respected museum administrator Claudine Brown to conduct a formal study of the museum issue.

Brown's group reported six months later that the Smithsonian should form a high-level advisory board to conduct a more thorough study of the issue. The Brown study was blunt in its discussion of the divisions within the African-American community about the advisability of a stand-alone national museum of African-American culture and history, but also forceful in its advocacy of a national museum of national prominence and national visibility with a broad mandate to document the vast sweep of the African-American experience in the United States. The study was also highly critical of the Smithsonian's ability to adequately represent African-American culture and history within an existing institution, and its willingness to appoint African-American staff to high-ranking positions within the museum.

The Smithsonian formed a 22-member advisory board, chaired by Mary Schmidt Campbell, in May 1990. The creation of the advisory board was an important step for the Smithsonian. There were many on the Smithsonian's Board of Regents who believed that "African-American culture and history" was indefinable and that not enough artifacts and art of national significance could be found to build a museum. On May 6, 1991, after a year of study, the advisory board issued a report in favor of a national museum, and the Smithsonian Board of Regents voted unanimously to support the idea. However, the proposal the regents adopted only called not for a stand-alone institution but a "museum" housed in the East Hall of the existing Arts and Industries Building. The regents also agreed to keep the Anacostia Community Museum a separate facility; to give the new museum its own governing board, independent of existing museums; and to support the proposal for a grant-making program to help local African-American museums build their collections and train their staff. The regents also approved a "collections identification project" to identify donors who might be willing to donate, sell, or loan their items to the proposed new Smithsonian museum.

1990s efforts The Smithsonian Board of Regents agreed in September 1991 to draft museum legislation, and submitted their bill to Congress in February 1992. The bill was criticized by Tom Mack and others for putting the museum in a building that was too small and old to properly house the intended collection,; and despite winning approval in both House and Senate committees the bill died once more. In 1994, Senator Jesse Helms refused to allow the legislation to come to the Senate floor (voicing both fiscal and philosophical concerns) despite bipartisan support.; ;

In 1995, citing funding issues, the Smithsonian abandoned its support for a new museum and instead proposed a new Center for African American History and Culture within organization. The Smithsonian's new Secretary, Ira Michael Heyman, openly questioned the need for "ethnic" museums on the National Mall. Many, including Mary Campbell Schmidt, saw this as a step backward, a characterization Smithsonian officials strongly disputed. To demonstrate its support for African-American history preservation, the Smithsonian held a fundraiser in March 1998 for the new center which raised $100,000 (~$ in ).

Heymann left the Smithsonian in January 1999. In the meantime, other cities moved forward with major new African-American museums. The city of Detroit opened a $38.4 million, Museum of African-American History in 1997, and the city of Cincinnati was raising funds for a $90 million, National Underground Railroad Freedom Center (which broke ground in 2002).; In 2000, a private group—upset with congressional delays—proposed constructing a $40 million (~$ in ), museum on Poplar Point, a site on the Anacostia River across from the Washington Navy Yard.

Passage of federal legislation

In 2001, Lewis and Representative J. C. Watts re-introduced legislation for a museum in the House of Representatives. Under the leadership of its new Secretary, Lawrence M. Small, the Smithsonian Board of Regents reversed course yet again in June 2001 and agreed to support a stand-alone National Museum of African American History and Culture. The Smithsonian asked Congress to establish a federally funded study commission. Congress swiftly agreed, and on December 29, President George W. Bush signed legislation establishing a 23-member commission to study the need for a museum, how to raise the funds to build and support it, and where it should be located. At the signing ceremony, the president expressed his opinion that the museum should be located on the National Mall.