Final answer:
The major element of Radical Republican plans for their version of Reconstruction for the south was based on granting full fledged citizenship to the freedmen.
Step-by-step explanation:
The major element of Radical Republican plans for their version of Reconstruction for the south was based on granting full fledged citizenship to the freedmen. They wanted to ensure that the rights of the freedpeople were protected and that they were given equal status as citizens. This was part of the Radical Republicans' goal to promote social change and push the nation to fully realize the promises of equality and unalienable rights.