There are lot of confused comments in this thread.
TFA is not about ordinary bromine used in the chemical industry, which is extremely cheap and easily available everywhere.
TFA is about semiconductor-grade pure bromine, which, like all chemical substances used in the semiconductor industry is very expensive and it is not produced by most bromine producers.
Nobody in this thread has pointed to any evidence that USA produces semiconductor-grade pure bromine. The fact that it produces ordinary bromine is irrelevant.
You're all over this comment thread spreading your speculation as fact. Semiconductor-manufacturing grade bromine (specifically anhydrous hydrogen bromide) is, in fact, made in the US.