Expression '... he said to a long roar'?

[Nessie]

Hi,
Please have a look at this:

"It’s been a long time coming, but tonight, because of what we did on this day, in this election, at this defining moment, change has come to America,”

[Skrej]

Yes, that's correct.

It's saying that as the speaker finished that sentence, the crowd roared (in approval).
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