République démocratique hongroise
By 1918, Isac was seeking to obtain an amicable solution to the ethnic conflicts rekindled by the war, in the context of Austria-Hungary's dissolution, the Aster Revolution, and the advent of a Hungarian Democratic Republic. As early as 1917, Isac signed an open letter, published by "Világ", in which he rallied with pacifist thinker Oszkár Jászi (who became Minister of Nationalities in the Aster Revolution), arguing: "For us of the [other] nationalities your name in recent months has sounded like a reassuring chime of bells, your name has signified to us vigorous defense, and through your writings democratic Hungary has made its voice heard." Historian György Litván notes that this was the type of messages motivating Jászi to "stubbornly" believe that his Danubian Confederation projects could win support from all sides, even though other reactions were already showing their practical limitations and their unpopularity.