The main concept is that of an international solidarity expressed in practice through worldwide division of labor: free trade is the principal point in the program of internationalism.
Christian Lous LangeA pacifist will often - at least nowadays - be an internationalist and vice versa. But history shows us that a pacifist need not think internationally.
Christian Lous LangeInternationalism is a community theory of society which is founded on economic, spiritual, and biological facts. It maintains that respect for a healthy development of human society and of world civilization requires that mankind be organized internationally. Nationalities should form the constitutive links in a great world alliance, and must be guaranteed an independent life in the realm of the spiritual and for locally delimited tasks, while economic and political objectives must be guided internationally in a spirit of peaceful cooperation for the promotion of mankind's common interests.
Christian Lous Lange