Many other Americans have followed Carnegie’s lead and done the same thing. For example

he believed that congress would be better not dealing with "lobbyists", or people who seek to influence (a politician or public official) on an issue, since historically, they had problems with these kinds of people. he thought lobbying produces benefits, but should be carefully monitored.

i believe it is capitalists.  

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else