Yugoslavia failed to be a country.
The Kingdom of Yugoslavia had unitary policies, suppressed autonomy and proclaimed the official ideology to be that Serbs, Croats, Bosniaks, Montenegrins, Macedonians and Slovenes were tribes of one nation of Yugoslavs (see Yugoslavism), to the heavy disagreement and resistance from Croats and other ethnic groups; this was interpreted as gradual Serbianization of Yugoslavia's non-Serb population
 On 6 January 1929, King Alexander I got rid of the constitution, banned national political parties, assumed executive power, and renamed the country Yugoslavia

