Important is a very subjective thing but a whole lot of stuff is made in China. https://www.npr.org/2011/09/16/140515737/california-turns-to-china-for-new-bay-

Important is a very subjective thing but a whole lot of stuff is made in China. https://www.npr.org/2011/09/16/140515737/california-turns-to-china-for-new-bay-bridge https://www.npr.org/2011/09/16/140515737/california-turns-to... "The steel contract went to a state-owned Chinese company, Shanghai Zhenhua Heavy Industries, which had several advantages: modern production facilities, ships to deliver the steel and, of course, low-cost labor." I would say the cabling of a suspension bridge is pretty important.