Delaware Governor Jack Markell has signed a resolution apologizing for the state's role in slavery.
The government of Qatar has arrested BBC journalists for their investigation into the conditions of workers, said to be treated as slaves, building stadiums for the 2022 World Cup.
Hundreds of fisherman who were being kept as slaves have been freed.
Obama's remarks during the National Prayer Breakfast calling on people to get off their "high horse" raises a storm of protest.
