Conversation so far:
What did Johan Galtung think about the US?
For Johan Galtung, the US is simultaneously a republic and an empire, a distinction he believes is highly relevant.
Can you explain Johan Galtung's distinction of the US being simultaneously a republic and an empire?
The US is on one hand loved for its republican qualities, and on the other loathed by its enemies abroad for its perceived military aggressions.
Did Johan Galtung write anything about the US?
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.

Question: What was the title of his 2009 book?
Self-contained rewrite: What was the title of Johan Galtung's 2009 book?