The rules for the European partition of Africa were formalized at the Berlin Conference of 1884–1885, convened by German Chancellor Otto von Bismarck. This diplomatic gathering of 14 powers (including all major European states, the U.S., and the Ottoman Empire) established the legal framework for the "Scramble for Africa."
No African rulers were consulted. The conference accelerated the carving of the continent into ~50 colonies with arbitrary straight-line borders, ignoring ethnic, linguistic, and cultural boundaries – a legacy of conflict and instability that persists today.