It is good to see the changes that you have made here. It is good that you have included citations and defined blackbirding. A couple things that I guess I missed last time you posted this:
You can’t say “between the period…” You could say “In the period from 1863 to 1904…” Or you could say “Between 1863 and 1904…” But “between the period is not correct.
In the US, at least, we refer to the Solomon Islands and not to “Solomon.” Unless this is different in Australia, you should change that.
Similarly, we would not say “25 hundred” of “80 thousand.” We would put it in numerals as you did earlier in the paragraph.
In that same sentence, perhaps you should say “of the 80,000 people in the urban area.”
Overall, though, this is better than previous drafts.