Do you need all dawn of war 2 expansions to play all races?

No, you do not need all the expansions for Dawn of War II to play all races. While each expansion introduces new factions and units, the base game and subsequent expansions allow access to different combinations of races. For instance, the base game includes Space Marines and Orks, while the expansions add additional races like the Eldar and Tyranids. However, to experience the full range of factions, it's recommended to have all expansions.