The progressive movement wasn't a Democrat or Republican movement. During the Progressive era there were as many progressives in the Democrat party as there were in the Republican party.
A true progressive is a nationalist socialist. Those progressives of today are something else, mostly Marxist, radical leftist, internationalist socialist, etc.
Theodore Roosevelt, Woodrow Wilson, Dillingham, Bellamy were all progressives, some were Democrats some were Republicans but all were racist. You can't call yourself a progressive unless you believe that northern Europeans are superior to other ethnicities and races.
It's a possibility that the progressives of today are still closet racist since they believe that certain minorities are inferior and can't compete in society and need special privileges and protections to compete in society.