Lean, single-source buying is efficient because it removes slack, and that is also its weakness. When one plant, port, or border closes, there is no spare capacity to absorb the shock. Boards that once treated sourcing as a cost line now treat it as a risk exposure. Lean sourcing optimizes for the average day; resilience planning optimizes for the worst one. The response is supply chain diversification: spreading purchases across more suppliers, regions, and routes so that no single failure can halt production.
Several shocks arrived in quick succession. In 2020, shortages of protective medical equipment showed how dependent hospitals were on a few overseas producers. In 2021, a semiconductor shortage forced automakers to cut vehicle output, even though chips make up a small share of a car's cost. In 2023, drought restricted transits through the Panama Canal, while attacks on Red Sea shipping pushed carriers onto the far longer route around southern Africa. The lesson is that US supply chain problems rarely appear where they begin. A failure several tiers upstream surfaces months later as an empty shelf or an idle assembly line. Policy added pressure. Tariffs on many Chinese goods took effect from 2018. A 2021 executive order then directed federal agencies to review the resilience of critical sectors, including semiconductors, pharmaceuticals, critical minerals, and large-capacity batteries.
It is not a single move, and it is more than leaving one country. There are four dimensions:
more than one qualified source for key inputs.
production spread across different regions.
alternative ports, carriers, and transport modes.
visibility into your suppliers' suppliers.
Supply chain diversity in this fuller sense is what separates real resilience from the appearance of it. A buyer with three suppliers that all depend on the same upstream mill has diversified on paper only. This hidden concentration is a common blind spot even in large organizations. For newcomers, the takeaway is simple: count how many independent sources you have, not how many invoices. It also helps to match effort to importance. Effective diversification of supply chain exposure should follow criticality, not be applied evenly. A commodity item with many substitutes needs far less protection than a single-source component that would stop a production line.
Does the data bear this out? According to the US Census Bureau, China's share of US goods imports fell from roughly 22 percent in 2017 to about 14 percent in 2023, the same year Mexico became the largest source of US goods imports. Public investment reinforces the trend: the CHIPS and Science Act of 2022 allocated about $52.7 billion to semiconductor manufacturing, research, and workforce development. Together, these moves are reshaping the supply chain in US manufacturing, from electronics to automotive.
Diversification is not free. Qualifying a second supplier takes time, duplicated tooling costs money, and splitting volumes can weaken pricing leverage. Nearshoring is no cure-all either. Direct import figures can also mislead: a Federal Reserve analysis found that several countries gaining US market share, Vietnam and Mexico among them, also became more reliant on imports from China, so moving final assembly may leave the upstream dependency untouched. The real question is how much redundancy is worth buying. That means weighing the cost of a stoppage against the cost of insurance, and not every US supply chain issue justifies the expense.
Map suppliers beyond tier one for your highest-spend and highest-risk items.
Rank those items by what a stoppage would cost and how easily each can be replaced.
Qualify a second source for the top of that list before a crisis forces the decision.
Stress-test the network against scenarios such as a port closure or a supplier shutdown, then track lead times and concentration over time.
Cognitud helps procurement teams turn these principles into decisions. Our procurement consultants map supplier networks beyond tier one, assess concentration and country risk, compare total landed cost across alternative sources, and design qualification plans for second suppliers. We also stress-test sourcing plans against scenarios such as port closures or supplier shutdowns, and support teams through supplier negotiations and onboarding. The result is a sourcing strategy that balances resilience with cost and shows which categories to diversify first.
