The northern republicans react to the new members of congress who joined in 1866 as they outraged that former confederates were able to join congress. Thus the 2nd option is correct.
<h3>Who were northern republicans ?</h3>
Northern republicans were the members of the political parties known as the Republican party which was formed in 1854.
The reason that led to the formation was they were against slavery so many people like northern Protestants, factory workers, professionals, businessmen, prosperous farmers, and after the Civil War, former black slaves came together and formed the Republican party.
In the Congressional elections of 1866, president Johnson lost as the northern voters rejected him as a president. They were angered from the former confederates who were able to join the congress. This led to the victory of radical republicans.
Learn more about Republicans here:
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