Well, I thought the meme was pretty clear, it was a tongue-in-cheek response to how weak on border gets you conquered. But I don't know why some people always have to read more than that. So now you get a free history lesson.
First of all, there is no such thing as a Native American country. The indigenous people of America were separated into various tribes, they never formed a nation. So as a whole they had no borders b/c no borders = no nation and vica versa.
Secondly, tribally, certain tribes do have borders. You know what happens when you trespass into Apache hunting ground? Into Apache land? You get scalped. So all of the sudden being detained and given a bed with 3 square meal until your asylum request is processed suddenly doesn't seem so harsh anymore, eh?
3rdly, I always enjoy the simple minded emotionally driven little people and their narrow mindedness. Conquest of indigenous people by a superior culture is not isolated to Europeans. It happens everywhere all through history. You think Japanese were indigeous to Japan? No, original Japanese islands were filled with indigenous people groups such as the Ainu, the Okinawans, etc... They were all eventually conquered and assimilated and often just as brutal as the Europeans with the natives here. Watch "Seeddiq Bale" if you want to know what Japanese did with the natives of Formosa before it became Taiwan.
But Like I've said, it goes way further beyond that and all through history. The Greeks/Indians today were conquered by a nomadic Aryan race way back. This is why Sanskrit and Classical Greek are essentially the same language. The conquerer put the dark skinned indigenous people on the bottom caste while the light skinned rulers were in the upper caste of the Indian society.
But anyways, as someone has pointed out, invaders don't always come with open hostilities, often they come with a false sense of friendship or false sense of need. Don't be naive about the human nature.
What good is a "democracy" when all your enemies have to do is saturate your population until you are the minority? And then using your own gov system of democracy to change your nation and conquer it?
Think it over.