How did Northern Republicans react to the new members of Congress who joined in 1866?

They were outraged that former Confederates were able to join Congress.

Explanation:

The congressional elections of 1866 brought about the northern voters rejecting President Johnson's view of Reconstruction. They were outraged that former Confederates were able to join Congress and handed a major victory to the Radical Republicans. This act made the Radical Republicans to be in control of Reconstruction although they were opposed by some people.

accomplishment : zachary taylor’s was a national war hero in his battle in an mexican war

explanation:

he was known as a national war hero for his battles in the mexican war, taylor was elected as the 12th president of the united states in 1849. he led the nation during its debates on slavery and southern secession. after serving only 16 months in office, taylor died from cholera morbus on july 9,