In 1831, french explorer jules dumont d’urville proposed dividing the pacific island region into three groups based on geography and culture. the island groups were

Melanesia, Micronesia, and Polynesia

Explanation:

Melanesia is a group of bigger islands located just NorthEast of Australia, that goes from New Guinea to Fiji.

Micronesia is a series of smaller islands located NorthEast of New Guinea that extend up to Wake and Kiribati.

Polynesia is a large collection of about 10,000 small islands forming roughly a triangle between New Zealand, Hawaii and Easter Island.

there's multiple reasons why the conquistadors were so successful in colonizing central america, and some of them are:

- they were seen as gods;

at the beginning, the spanish settlers were seen by the natives as gods, and this was mainly due to their white skin, and the way they came with their boats.

- possessed superior weaponry;

the spanish had gunpowder and guns, as well as cannons, while the natives did not had any fire weapons.

- made cleaver alliances;

they used the situation of tribes hating each other, so they made alliances with some of them which served them very well.

- brought diseases;

the native people were not immune to certain diseases the europeans brought with them, so they were dying from seeming harmless things for european standards.