How did the amnesty act the democratic party regain its strength.

The Amnesty Act changed the political balance in the South by restoring full rights to people who supported the Democratic Party. In Southern states such as Virginia and North Carolina, where a majority of voters were white, Democrats soon regained control of state governments.

The amnesty Act changed the political balance in the South by restoring full rights to the people who really supported the Democratic Party.
 
Then, In Southern states(such as Virginia and North Carolina), where a majority of voters were white, Democrats soon regained control of state governments.

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Your answer is b , public works