For all the wishful thinking about manufacturing more laptops and iPhones in the U.S., there is one sector of tech manufacturing where America remains a leader: computer chips. From a report: Some $44 billion worth of semiconductors are exported from the U.S. each year, making them America's fourth leading manufacturing export after cars, airplanes and refined oil. There are roughly 80 wafer fabrication plants (aka fabs) in the U.S., spread across 19 states. [...] An even greater share of the world's computer chips are designed domestically and made overseas by companies including Qualcomm, Apple, Broadcom and Nvidia. A bunch of the high-tech gear needed to produce chips is also designed and/or made in the U.S.