A Republican.
Theodore Roosevelt was a Republican. Franklin D. Roosevelt was a Democrat.
A Republican.
Democrat.
FDR was a democrat.
FDR was a democrat.
No, he was a Democrat.
Republican
Nelson Rockefeller was nominally a Republican, of the variety often called "RINO" or "Republican In Name Only" or "Country Club Republican". His political views were essentially the same as those of a "moderate democrat".
Of the three, Dr. Woodrow Wilson was the Democrat.
Both were Democrats.
Pierce was a Democrat, belonging the party that Andrew Jackson started around 1825.
TR was a proponent of national greatness rather than that of individual states, which suited the Republican Platform nicely. In his time, the Democrats were still associated with the south and with the Rebel cause in the Civil War; TR was from New York, a Union state.