Sentence:  Not everyone agreed with this logic, since in many colonies European men continued to establish commonlaw relationships with indigenous women even where marriages with European women were frequent. The critical economist Moritz Bonn made himself unpopular with German colonial authorities when he claimed in the first decade of the twentieth century that “[t]he main cause of <WSD>bastardization</WSD> in Africa was not the absence of white women but the presence of black ones. 
Meaning of the word marked with <WSD> tags:  The combining of separate races in marriage or breeding; miscegenation.