Joseph Glidden is credited with inventing the first commercially successful 'winner' barbed wire. By twisting two wires together to hold sharp barbs in place, he created a cheap, durable, and effective fencing material. In the American West, where timber and stone for fences were scarce, barbed wire allowed ranchers to enclose vast territories. This invention ended the era of the 'Open Range' and the traditional cowboy lifestyle, leading to the privatization of land and frequent 'range wars.' Later, barbed wire was adapted for military use, becoming a defining feature of WWI trench defenses and the boundaries of prisons and borders. It remains one of the most significant, if controversial, inventions in the history of land management and security.