It is believed that modern humans like you and I first originated on the Earth around 50,000 years ago in Africa. These modern humans are referred to by historians as Homo sapiens sapiens. Within just a few thousand years these modern humans had spread to every continent across the entire planet, and onto many islands.
As Homo sapiens sapiens migrated outward from Africa, it is believed that they wiped out Neanderthals, either by absorbing them through intermarriage, or by destroying them through war and competition.
There is no fence or hedge round time that has gone. You can go back and have what you like if you remember it well enough.
On October 1874 Joseph Glidden received a patent for barbed wire. There were many lawsuits over the patent, and Glidden won every one of them. Eventually more than two thousand variations of barbed wire were developed.