I really don't get what do you mean by "it never functioned without giving them something new/better". Spaniards completely destroyed colossal and magnificent civilizations like Incas and Aztecs, turned them into half-slaves and and turned their empires into loot farms. Explain to me what exactly didn't "function" in that conquest and what was the "new/better" thing Spaniards did to make it "function". Mongols destroyed numerous ancient civilizations and turned the surviving people into slaves and/or assimilated them into a roving horde. Barbarians destroyed the Western Roman Empire and brought dark ages wich lasted for the next one thousand years.