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Throughout world history, great civilizations have survived and extended their rule through dependence on great infrastructures. Rome had its roads and aqueducts. The Mayans had their pyramids and palaces. But what happens when society neglects its infrastructure? Right now, the U.S. infrastructure is collapsing and it impacts every single person in this country. In the first half of the 20th century, our bridges, highways, tunnels, dams, levees, ports, water and gas pipelines were built during the greatest age of construction the world had ever seen. But now these steel and concrete achievements are deteriorating. More than 70,000 of our nation's bridges are rated structurally deficient. Massive grid failures have left millions in the dark. 25,000 miles of commercial navigable waterways and locks have exceeded their 50-year design life. Everything from dilapidated levees to pipelines to railroads is past their expiration date.