I think the GP is trying to say that because of the military ecosystem in the US, it was easier for him to 1. find a large customer and 2. get r&d funding. Note that he says "They are direct results of the military ecosystem that has developed there."
Why do you think Elon Musk chose to start SpaceX in the US?
Why do you think Elon Musk chose to start SpaceX in the US?