According to Galtung, the US empire causes "unbearable suffering and resentment" because the "exploiters/ killers/ dominators/ alienators, and those who support the US Empire because of perceived benefits" are engaging in "unequal, non-sustainable, exchange patterns". In an article published in 2004, Galtung predicted that the US empire will "decline and fall" by 2020. He expanded on this hypothesis in his 2009 book titled The Fall of the US Empire - and Then What?