As manufacturing expanded, businesses became major players in state affairs and funders of politicians through families such as the Du Ponts. Republican John Addicks attempted to buy a US Senate seat multiple times in a rivalry with the Du Ponts until the passage of the Seventeenth Amendment. The allegiance of industries with the Republican party allowed them to gain control of the state's governorship throughout most of the twentieth century. The GOP ensured blacks could vote because of their general support for Republicans and thus undid restrictions on black suffrage.