One success of reconstruction was the
a. extension of suffrage for women
b. shift in the balance of power toward the federal government
c. protection of full citizenship rights for african americans
d. introduction of a tax-supported public school system in the south

One success of Reconstruction was the "b.shift in the balance of power toward the federal government", since many of the laws aimed at increasing the rights of African Americans failed to be properly implemented. 

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.