Good question. Ignorant answer. (You got my vote for posing the question.)
If you want to know what life would be like without borders, review any of the "warlord periods" in recorded history. Warlords are what you get when there are no warlords. Borders are what you get when one warlord succeeds in becoming a king by conquering his neighboring warlords. Nations are what you get when kings become weak and stupid. Global war and nuclear detonations are what you get when the people of each nation become weak and stupid. Warlords are what you get the day after the nuclear detonations. (And the cycle repeats.)
Those who don't know history are not only doomed to repeat it. They are also doomed to be ridiculed on steemit. :)
Thanks for your input however I don't agree with it on this occasion! :)
My intent is friendly and I welcome your post. But the idea that humanity doesn't need fences (or borders) seems so naive to me that I would in a friendly spirit challenge you to explain how things would work.
Please pick a particular border that you would do away with, and we can discuss what the effects would be. Or frame your response in some other way. But don't just say that you don't agree! Explain why!