All but Hayes were Democrats. Tyler and Pierce were fierce proponents of the interests of the slave power. You can call this conservatism if you like, but I disagree.
Read RECARVING RUSHMORE, by Ivan Eland. He makes some very valid points, including the fact that our history books embrace “the war Presidents”, and ignore the men who have treated the Presidency as humble, and passive, caretakers.
Yet, the needless carnage, and destruction wrought by “the war Presidents”, Wilson, Lincoln, FDR, and LBJ, lasted long after each man left office.
Wilson may have been the absolute worst( read WILSON’S WAR, by Jim Powell ). But, the others were awful as well.