The Macedonian Ilinden Uprising is considered a geopolitical event of world proportions. Not surprisingly, the US postal service honored the late Macedonian revolutionaries with stamps back in 1928.
The stamps feature Delchev, Toshev, Gruev, Aleksandrov, including a map of undivided Macedonia with Aegean and Pirin Macedonia.
One can imagine Borisov and Tsipras will enjoy this.