Could you provide a few examples? Liberals love to claim credit for everything they think is good but not so much the bad. I can't think of one thing that can be credited to progressives.
Lincoln would be my answer to your question. Yes liberal/progressives love to take credit for Lincoln but he CONSERVED the union and freed the slaves a very conservative thing to do. Democrats/liberals/progressives, actually did put them all in chains.
While the contemporary Conservative wants to shrink the size and influence of the federal government, Lincoln fought a war to preserve the power of the federal government! Conservatives cannot claim Lincoln.
If that were actually true you would be on to something. Lincoln repeatedly said he was fighting the war to preserve the Union and end slavery. Lost causers keep wanting to make the war about states rights but in reality it was all about democrats keep men in chains.
But, as for examples, let's look at women's rights. Do you think Phyllis Schlafly was a Liberal? She provided a good part of the resistance to the women's movement. Gloria Steinhem, Helen Gurlie Brown and other Liberals were at the vanguard of the movement.
Again, liberals/progressives try and take credit for everything they think turned out well regardless of their influence. Yes, these women went against the establishment and to form a more perfect union but that does not in and of itself make them progressive/liberals or conservatives. They were what they were correcting a wrong.
Civil rights? Do you think that George Wallace, Strom Thurmond, Lester Maddox and David Duke were/are tree hugging Liberals? Any of those rogues would be welcomed like old lodge brothers at any Conservative rally.
So writes the history as told by progressives. The scenario is always the same. The liberal/progressive laws down their version of conservatives then proceed to argue to that presupposition.
I've answered some of your questions. Now reciprocate if you please. Name one Conservative who has ever championed any societal change that resulted in equal justice, egalitarianism or personal liberties.