In this case, they were doing repeated voyages and running trade routes across these masses of ocean. It wasn't undesirables. The second major settling of Hawai

In this case, they were doing repeated voyages and running trade routes across these masses of ocean. It wasn't undesirables. The second major settling of Hawai'i, for example, was by Tahitians who took over and maintained strong ties to Tahiti for quite a while before they went into a period of isolation.