Territorial occupation only became a central concern for Portugal in the last decades of the 19th century, during the European powers' "Scramble for Africa", especially following the 1884 Berlin Conference. A number of military expeditions were organized as preconditions for obtaining territory which roughly corresponded to that of present-day Angola. However, as late as 1906 only about 6% of that territory was effectively occupied, and the military campaigns had to continue. By the mid-1920s, the limits of the territory were finally fixed, and the last "primary resistance" was quelled in the early 1940s. It is thus reasonable to talk of Angola as a defined territorial entity from this point onwards.