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.
What was the title of Johan Galtung's 2009 book?
He expanded on his hypothesis in his 2009 book titled The Fall of the US Empire - and Then What? Successors, Regionalization or Globalization? US Fascism or US Blossoming?

Question: What responses were there to his prediction?
Self-contained rewrite: What responses were there to Johan Galtung's prediction of the US Empire's decline by 2020?