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Personally, Holden died in 2017 for me. Honestly, comes down to marketing.
Stupid yanks don't realise how popular Australian's are in the US. Why call it a G8 or SS. All they had to do was call it a Holden Commodore and market it as the Australian car and tap into the mindset Australia has been fighting along side the US since WW2.
I think they would have sold well, American's are patriotic and would have loved owning and supporting arguably the most dependable ally the US has had. Per capita, we sent near 5-10% of our total population overseas to fight world war 2.
All they had to do was call it a Holden Commodore and market it as the Australian car