If you consider the Ipad came out in 2011, which was 5 years ago (for a few more days), I would say 5 years. Touchscreen devices make up about half of the globa

If you consider the Ipad came out in 2011, which was 5 years ago (for a few more days), I would say 5 years. Touchscreen devices make up about half of the global electronics industry, so by extension half of Shenzhen was built to accommodate that. With a focused agenda, the US could rebuild a supply chain in 5 years if it wanted to. I think it is unlikely to want to however.