Which of the following technological developments was most responsible for a massive increase in productivity during the Gilded Age?
Invention of the light bulb
Invention of the telephone
Expansion of the railroad system
Mass production of steel

During andrew johnson’s presidency, the radical republicans gained control over policymaking in congress. they had enough power to override any presidential veto. how did the radical republicans use this opportunity? a. they blocked johnson’s weak reconstruction policies by taking charge of the reconstruction plan. b. they extended their support to johnson’s policies for reconstruction of the south. c. they removed johnson from office and took over the task of reconstructing the south. d. they removed all former confederates from office and stopped the south from rejoining the union.