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📘 How does a country's infrastructure work?

Country infrastructure is not a single bridge on a postcard. It is several networks running at once: power, water, transport, and communications. When they work, you notice almost nothing. When one slips, breakfast becomes a scramble.

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. See the networks, not the monumentsDefine critical infrastructure and name the four lifeline sectors that underpin other services.National infrastructure is a set of interdependent networks. CISA's 16 sectors and four lifelines show which failures hit first — and ownership is mixed by sector.
  2. Follow the path from source to serviceTrace electricity, water, freight, and communications from source assets to everyday service.Each lifeline is a path: power is stepped up and down across ~160,000 miles of high-voltage lines; water is sourced, treated, stored, and distributed; freight is a relay of handoffs; communications steers the rest.
  3. Keep services working under pressureExplain interdependencies, condition grading, and the build-versus-maintain trade-off.Services fail in cascades. ASCE's 2025 C grade and multi-trillion-dollar gap show that maintenance and resilience are part of how infrastructure "works," not extras after ribbon-cuttings.

Questions this course answers

Which four sectors does CISA's infrastructure dependency primer call fundamental to almost all other sectors?

CISA highlights Energy, Communications, Water, and Transportation as critical to the operations of almost all other sectors and to each other.

Put the usual electricity delivery path in order.

DOE materials describe generation, stepping voltage up for transmission, then stepping down for local distribution to customers.

Match each claim to the better-supported reading.

CISA reports majority private ownership overall and >80% for energy; EPA reports ~90% on public water systems; ASCE's 2025 overall grade is C.

Grounded in trusted sources

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