In 1908, Austria-Hungary annexed Bosnia and Herzegovina sparking the Bosnian Crisis, which eventually led to World War I.

[4] On the other hand, the first Partisan battalion established in Gacko at the end of 1941 was named "6th June" in honor of the first date of the uprising.

[6] During the Bosnian War most of the non-Serb population of Gacko and East Herzegovina was driven out or murdered by the VRS and affiliated Serb nationalist paramilitary[7][8] groups during the creation of the then self-declared Republika Srpska entity.

The following table gives a preview of the total number of registered people employed in professional fields per their core activity (as of 2018):[9] The local football club, FK Mladost Gacko, plays in the First League of the Republika Srpska.

Una-Sana  Central Bosnia Posavina  Herzegovina-Neretva Tuzla  West Herzegovina Zenica-Doboj  Sarajevo Bosnian Podrinje Canton 10