Our economical system is built after the winners win and losers lose out. But the answer is Capitalism. Hope this helps.
<u><em>Basically for political interests and expansion. </em></u>
<u><em>Infact new leaders could be found in the different new cultures in case of problems with America or Europe. Through the conquest and migration, Polynesian culture was introduced in the isles too, beyond the initial territories</em></u>