In Ireland, then part of the United Kingdom, the nationalist Easter Rising of 1916 anticipated the Irish War of Independence (1919–1921) within the same historical period as this first wave of communist revolution. The Irish republican movement of the time was predominantly a nationalist and populist form of radical-republicanism, and although it had left-wing positions and included socialists and communists, it was not communist. The Irish and Soviet Russian Republics, nevertheless, found common ground in their opposition to the British Empire and established a trading relationship. However, the British historian E. H. Carr later commented that "the negotiations were not taken very seriously on either side". Both the Irish Republic and the Russian Soviet Federative Socialist Republic were pariah states that were excluded from the Paris Peace Conference (1919–1920).