anchor: In the aftermath of the Opium Wars, trade in  foreign mud  was resumed at a level even higher than before, although the major traders, by now respectable and diversified, stopped their trading in 1907.
positive: Trade in foreign mud was resumed at a level even higher than before, in the aftermath of the Opium Wars.
negative: In the aftermath of the Opium Wars, trade in foreign mud was at the lowest level ever, because the major traders, by now respectable and diversified, stopped their traidng in 1907.