The Incident That Caused the Clash Between Congress and President

The incident that caused the clash between Congress and President Johnson to explode into the open in February 1866 was

A) passage of the Pacific Railroad Act.
B) the creation of the sharecropping system.
C) the attempt to pass the Fourteenth Amendment.
D) the South's regaining control of the Senate.
E) Johnson's veto of the bill to extend the Freedmen's Bureau.