C111 No Mention of the past
From the looks of it, Euler didn't come to Nanxing on a whim, and it wouldn't be a coincidence to deal with him. Although the Black Sound Party had a foundation in America, it wasn't deep. If the Eagle Sect rose up now, it might not affect them much.
What changed would only be the distribution of power in America and the future.
The Black Sound Party was an assassination organization