Pan-Slavic geopolitics preceded Pan-German ‘thinking in continents’ by decades.

Evidence

Pan-Slavism, the first of the panisms (see Hoetzsch, Russland, Berlin, 1913, p. 439), expressed these geopolitical theories almost forty years before Pan-Germanism began to “think in continents.” — Hannah Arendt, The Origins of Totalitarianism, 2392