Southerners resisted the Reconstruction Plan by establishing the KKK and killing freed slaves. Also, most of the old Southern leaders were still in charge so every Southern state passed 'black codes' which practically made blacks slaves again.
Hamilton and his associates, typically urban bankers and businessmen, then formed the Federalist Party to promote their shared political ideas. Federalists believed in a centralized national government with strong fiscal roots. In addition, the Federalists felt that the Constitution was open for interpretation.