OAKLAND, Calif. (AP) - Former President Barack Obama and Golden State Warriors superstar Stephen Curry told a roomful of minority boys on Tuesday that they matter and urged them to make the world a better place.

Obama was in Oakland, California, to mark the fifth anniversary of My Brother's Keeper, an initiative he launched after the 2012 shooting death of 17-year-old Trayvon Martin. The death of the African-American teen sparked protests over racial profiling.

The initiative was a call to communities to close opportunity gaps for minority boys, especially African-American, Latino, and Native American boys, Obama said to roughly 100 boys attending the alliance's first national gathering. The My Brother's Keeper Alliance is part of the Obama Foundation.

"We had to be able to say to them, 'you matter, we care about you, we believe in you and we are going to make sure that you have the opportunities and chances to move forward just like everybody else'," Obama said.

Obama, who left office in 2017, was joined by basketball star Curry. The men spoke for about an hour, answering questions from the audience and joking around. They talked about lacking confidence or being aimless as teens.

Obama praised single mothers, including his own. He advised the boys to look for a mentor and to find opportunities to guide others. Curry joined the former president in praising the value of team-work.