Final answer:
The Indonesian government's attempt to 'depurify' the Timor population likely refers to the violent suppression and forced displacement during occupation of Timor-Leste post-1975, leading up to its independence in 2002, although the term 'depurify' is not commonly used in historical accounts.
Step-by-step explanation:
The question "How did the Indonesian government attempt to depurify the Timor population?" refers to the period following Indonesia's occupation of Timor-Leste (formerly East Timor) in 1975. After declaring independence from Portuguese rule, Timor-Leste faced a violent civil war and subsequent annexation as the 27th province of Indonesia. The Indonesian government embarked on a campaign that some have characterized as an attempt at population 'purification', which involved forced displacement, violence, and the suppression of Timorese culture and resistance. The occupation lasted until 1999 when Indonesia relinquished control and Timor-Leste moved towards full independence in 2002, a process supported by peacekeeping efforts from countries such as Australia and recognized by the United Nations.
A comparison might be drawn with other historical events where governments attempted a form of 'cleansing' or 'purification', as with the genocide ideologies seen in the Killing Fields of Cambodia under Pol Pot or in the actions of colonial forces in Africa. Nonetheless, this question specifically pertains to the Indonesian government's actions in Timor-Leste. While the term 'depurify' seems incorrect or unclear in historical context, it appears the student is seeking information on how the government manipulated or coerced the population in this period.