Which statements about the events in Selma are true? Choose all answers that are correct.

More than twenty thousand people joined the final, successful Selma to Montgomery march to show they supported the civil rights movement.
President Johnson refused to support the march for fear of losing political support in the South.

The first time marchers tried to cross the bridge, they were attacked and beaten by state troopers.

Many Americans were sickened by what they saw on television.