One reason that people from Europe didn't have to fight very much for North and South America was that only 1% to 5% of natives were still alive after European diseases arrived

 So, it changed everything. With 80% to 95% of the people already dead from Smallpox and Flus and other diseases unknown in north and South America it basically wiped out all civilizations here in North and South America to the point where the ONLY way for Native North and South Americans to survive was to embrace the European ways. Those who didn't adapt only died or suffered and then died.

For me, it is an illustration of what would happen if more people understood fully how integrated UFOs are here on earth within our cultures. If people knew more than they did presently all civilization (at least as we presently know it) would end just like ALL civilizations ended when the Conquistadores and Pilgrims and everyone else arrived here from Europe and other places on earth.

So, it makes perfect sense to me why Governments don't want people to know very much about UFOS mostly so all Civilizations don't end suddenly (within a few years) like all North and South American cultures ended when Europeans and others came with more advanced techology and completely different ways than existed here before in the Americas.