American historian James Chace argues in his book "Endless War: How we got involved in Central America" (1983) that US policy in Central America is based upon the assumption that US hegemony is threatened within the region. According to Chace, US involvement in Central America worked towards resisting the domino effect of the spread of a "communist take-over", largely through establishing the credibility of US military. Though these policies were meant to deter conflict, they themselves created the conditions for instability in the region, which furthered a US response. This resulted in a self-perpetuating, or "endless", loop. He additionally argues US investment in pursuing an expanding military presence in Central America reflects an endless preparation for war.