That's just a stupid choice. The United States of America was responsible for the moon landing. End of story.
Why would any filmmaker have a meeting about whether or not it was appropriate to give credit mainly to the USA? Why would the thought even enter his head in the first place? It's pussy filmmaking. It wouldn't even be an audacious move to use the American flag in the scene since it's true, but I guess for Damian Chazelle it is very audacious.
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