When president johnson vetoed a law that would extend the freedmen’s bureau, congress reacted by

supporting the veto and closing the freedmen’s bureau.

writing a new law to show support for the black codes.

overriding the veto and expanding the agency’s powers.

drafting a law to prevent african americans from voting

The correct answer is C) by overriding the veto and expanding the agency's powers.

When President Johnson vetoed a law that would extend the Freedmen's Bureau, Congress reacted by overriding the veto and expanding the agency's powers.

President Johnson and Congress lived many moments of tension during the Reconstruction. President Johnson vetoes did not like the Congress and it became a permanent conflict between the legislative branch and the executive branch.  

The Freedmen's Bureau of 1865 was established to help African American people and poor white men that lived in the South, after the end of the Civil War. So it is true that when President Johnson vetoed a law that would extend the Freedmen's Bureau, Congress reacted by overriding the veto and expanding the agency's powers.