for example = 1850's -early 1870's Republicans supported civil rights, enviornmental issues, social justice. Dems were proslavery, anti social justice, champions of the status quo.
Once Grant came it is started turning around and by 1880 their politcal agendas were reversed.
I truly see what you are saying and I agree with it. But I am simply pointing out what was going on BEFORE Grant came in and the IR.