I see China as a growing threat to many /a lot of developed countries on several many fronts. Changed to avoid repetition of ' many'. You could change the first or second ' many'.
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New2grammarThank you, Optilang. You just corrected a mistake that I always have problem with. Why does the possive form fail in this example? I understand the US's as the US's GDPIt may not be wrong, and sounds better when there is something after it, such as GDP. I would always use America's in order to avoid it.