The two groups that explored and settled oceania were
maori
polynesians
aborigines
lapita

SOS:

The answer is Polynesians and Lapita!

The Lapita may have come from Taiwan and migrated first to New Guinea, and then to other nearby islands. Several hundred years later, the Polynesians arrived, probably from the Malay Peninsula. They supplanted the Lapita civilization and continued exploring the Pacific region, including New Zealand.

Hope this helps!

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker

i i think it might b c