These trees allow the player to control those nations during the war. Lots of additional contentĮxpansion - Hearts of Iron IV: By Blood Alone brings in three new focus trees-Italian, Ethiopian, and Swiss. This expansion introduces more content and game functionality to that base game. Players will manage their nation's defenses, research, politics, and more. Hearts of Iron IV is a very popular grand strategy game that allows a player to take control of a nation over the period that the Second World War took place.
