WASHINGTON — Centuries of struggles and strife, decades of planning and pain, and years of hoping for a place that African-American history can call home will culminate as President Barack Obama officially opens the Smithsonian National Museum of African American History and Culture.

A shining bronze beacon on the National Mall, only steps away from a monument dedicated to a slaveholder president, the new Smithsonian will chronicle the complex relationship between the United States and a people it once enslaved, and tell the story of those who worked to make the necessary changes to bring the country to where it is today.

Thousands were expected to gather on the National Mall on Saturday morning to watch the nation’s first black president cut the ribbon to open the museum. People are flying in from around the country to be some of the first inside, if they were lucky enough to get the coveted opening-day tickets.

Ground was broken for the new museum in 2012 on a five-acre tract near the Washington Monument after a decades-long push for an African-American museum on the National Mall. Congressman John Lewis of Georgia, a longtime civil rights icon, worked with then-Sen. Sam Brownback of Kansas to usher legislation through Congress, and President George W. Bush signed into law the bill that allowed the museum to move forward.

Construction was completed earlier this year on the 400,000-square-foot museum designed by British-Ghanaian architect David Adjaye. The museum strikes a unique shape on the Mall with its three-tiered bronze exterior panels inspired by an African wooden column.