This study weights the interrogation on the initial cross-border political dynamics preceeded coup d’etat by Pol Pot’s Khmer Rouge in 1970s as well as the nature of postcolonial resistance within the communist movement in Cambodia which are subtly reflected in “First, They Killed My Father”, a testimonio by Cambodian writer, Loung Ung. It intertwines international relations (IR) framework and postcolonial constellation to break down the geopolitical implicits, which include American offensive expansion and recent colonial employment within the Cold War’s context - rooted in the peculiar ‘American exceptionalism’ - to its certain corollary towards Cambodians’ lives as reflected in the narrative of Ung’s testimonio. The two main topics discussed in this study include the elaboration on Cambodian political reality within 1970s context, the employment of United States’ anarchy towards Cambodia which resulting in a rather elusive conduct of contemporary colonization, as well as the figuration of Cambodian communists as a resistance movement towards United States’ occupation. Initially, as communism rose significantly in Indo-China Peninsula, Cambodia was established as a contested land. United States, feared of growing Marxist ideology and North Vietnamese’s presence, furthermore, employed intelligence act to abolish Cambodian Norodom Sihanouk’s communist-friendly government and assigned a military general, Lon Nol, as the country’s leader. This foreign power’s interference to certain own hegemonical settlement in Cambodian political reality, then, creating a domino effect to emergence of a resistance, another coup by the prominent and massive Khmer Rouge. For this study, the IR framework of neorealism is constellated to support the theory of postcolonial resistance in order to further uncover the dynamics in Cambodian political realm as well as its contact with external forces, by the implication within the subtleties of Loung Ung’s testimonio. This study argues that the practice of neorealism anarchy by United States has resulted in a colonialism that is elusive, while it also elaborates that the communists Khmer Rouge, despite on their profound brutality, was originally initiated as a resistance movement towards US' control and settlement within Cambodian political reality.