Pole building design was pioneered in the 1930s in the United States originally using utility poles for horse barns and agricultural buildings. The depressed value of agricultural products in the 1920s and 1930s and the emergence of large, corporate farming in the 1930s created a demand for larger, cheaper agricultural buildings. As the practice took hold, rather than using utility poles, materials such as pressure treated posts and pole barn nails were developed specifically for this type of construction, making the process more affordable and reliable. Today, almost any low-rise structure can be quickly built using the post-frame construction method. Pole barn construction was a quick and economical method of adding outbuildings on a farm as agriculture shifted to equipment-dependent and capital-intensive agriculture—necessitating shelter for tractors, harvesters, wagons and the like in much greater quantities and sizes. Around North America, many pole-built structures are still readily seen in rural and industrial areas. Source: Wikipedia