America's AI Boom Still Runs Through Taiwan: The Chip Packaging Dependency That Threatens Economic Security

Three years and $39 billion in CHIPS Act subsidies later, America's newest semiconductor factories have a dirty secret: their chips still fly to Taiwan to become useful. The wafers stamped in Arizona, Ohio, and New Mexico—the ones that justified speeches about reshoring and sovereignty—cross the Pacific for the final assembly step that transforms raw silicon into AI accelerators and weapons-system processors. Washington funded the factory but left the assembly line abroad, creating a gap between policy theater and actual supply-chain security.

The Process That Makes AI Possible

Advanced packaging is the post-fabrication process that integrates multiple silicon dies—processors, memory, specialized chips—into a single high-performance package. TSMC's CoWoS (Chip-on-Wafer-on-Substrate) technology places multiple chips side by side on a silicon interposer, drastically reducing latency and increasing memory bandwidth. This isn't a finishing touch. CoWoS enables heterogeneous integration—combining logic processors with high-bandwidth memory in ways that improve power efficiency and performance far beyond what individual chips can achieve—making it the default choice for leading AI accelerators from Nvidia, AMD, and others.

Advanced packaging, not wafer fabrication, is now the primary bottleneck for AI chip production. Growing chip complexity and larger package sizes are pushing traditional organic substrates to their limits, with warpage during high-temperature assembly reducing yields—a technical challenge that keeps packaging scarce and concentrated.

What the CHIPS Act Funded—and What It Missed

The CHIPS Act did fund some domestic packaging, but the strategic incompleteness is stark. Intel received up to $7.86 billion in direct funding—the largest single allocation—for commercial semiconductor manufacturing and advanced packaging projects across Arizona, New Mexico, Ohio, and Oregon. It operates a Foveros advanced packaging facility in New Mexico and is one of the few firms with large-scale advanced packaging capacity in the U.S..

Amkor Technology is building the largest outsourced advanced packaging facility in the U.S. in Peoria, Arizona, with approximately $2 billion in total investment and up to $400 million in proposed CHIPS Act funding. The facility will employ around 2,000 people by 2028 and feature over 500,000 square feet of cleanroom space, with plans to expand to 750,000 square feet. Production is expected to start in early 2028, with Apple and Nvidia secured as lead customers through a 10-year partnership with TSMC.

The Department of Commerce announced a $3 billion plan in November 2023 to expand U.S. advanced packaging capability, acknowledging that the country currently lacks high-volume advanced packaging manufacturing. By early 2025, the Department awarded approximately $1.1 billion to Natcast to operate the National Advanced Packaging Piloting Facility, aiming to build domestic testing and integration capacity.

Despite these investments, the United States remains heavily dependent on overseas facilities for back-end semiconductor processes such as testing, cutting wafers, packaging, and assembly—even as new fabrication plants come online.

Taiwan's Staggering Concentration—and the Risk It Creates

The numbers expose the vulnerability. Taiwan accounts for 70–90% of global advanced chip packaging capacity; North America as a whole holds only about 3% of global assembly, testing, and packaging capacity.

TSMC handles about 90% of advanced packaging for AI chips globally, with Nvidia securing roughly 60% of that capacity—meaning the vast majority of the world's AI accelerators depend on a single company in a single country. TSMC's CoWoS capacity is sold out through 2026, with CEO C.C. Wei outlining planned expansions including new facilities in Chiayi and other Taiwanese sites. That capacity is growing at a compound annual rate of approximately 80% driven by AI demand—but nearly all of it remains in Taiwan. Industry analyses project that AI GPU supply will stay constrained until at least 2027, even as new CoWoS lines come online in the second half of 2026.

Commerce Department officials have acknowledged that proprietary supply chains in Asia prevent the U.S. from fully leveraging its front-end manufacturing investments without onshore packaging. CNBC reporting in April 2026 underscored the same geopolitical and supply-chain risk for AI hardware vendors.

The dependency extends beyond AI. U.S. defense systems, including the F-35 fighter jet, rely on semiconductors manufactured by TSMC, with the U.S. one to two generations behind in advanced chip technology for national security applications. Taiwan produces approximately 60% of the world's semiconductors and over 90% of the most advanced chips below 7nm, while U.S.-based manufacturing has fallen to roughly 10% of the global total.

The concentration creates risks from natural disasters such as earthquakes and droughts, pandemics, and geopolitical conflicts, including the potential for a Chinese quarantine or blockade. Experts argue that Taiwan's dominance acts as a "Silicon Shield"—a deterrent against Chinese military aggression because conflict would disrupt the global economy and U.S. defense posture, making war too costly for Beijing. National security experts at CSIS have warned that natural disasters or geopolitical conflicts could shut down production for a protracted period.

The Roundtrip That Undermines Domestic Production

Due to a lack of sufficient local CoWoS infrastructure, TSMC is reportedly air-shipping wafers produced in Arizona back to Taiwan for advanced packaging—an expensive, time-consuming logistics chain that defeats the purpose of domestic production. Every wafer crosses the Pacific twice before reaching American customers.

Harvard Business Review published analysis in April 2026 titled "Where the U.S.'s Chip Strategy Is Still Falling Short," explaining that key back-end processes remain concentrated abroad, leaving U.S. semiconductor supply chains strategically exposed. Domino Theory published analysis in June 2026 explaining that advanced packaging has become the chokepoint of the AI hardware stack—a concentration that makes fabrication investments incomplete without packaging sovereignty.

In a crisis, American AI companies and defense contractors would lose access to the capability that turns expensive silicon wafers into usable chips, rendering domestic fabs nearly useless.

The Commitment Required—and Whether It Will Come

TSMC plans to open a chip packaging plant in Arizona by 2029 with CoWoS and 3D-IC capabilities—but that timeline leaves at least three more years of vulnerability. Intel has recently elevated advanced packaging into a standalone business division, reflecting the growing strategic importance of the capability.

In late 2024, Commerce Secretary Howard Lutnick proposed a "50-50" production split with Taiwan to reduce dependency, but both the Taiwanese government and TSMC rejected the concept, viewing it as diluting TSMC's role and wary of U.S. protectionism. U.S. efforts to onshore production have raised fears in Taiwan that America might "hollow out" its chip industry, weakening the Silicon Shield and leaving Taiwan vulnerable to China—creating a geopolitical tension between American security and Taiwanese survival.

True supply-chain sovereignty would require not just building new facilities but replicating TSMC's proprietary CoWoS technology, training a specialized workforce, securing substrate and HBM supply chains, and sustaining investment over a decade—a scale of commitment that current policy has not yet matched.

Nvidia CEO Jensen Huang has said that manufacturing bottlenecks such as limited EUV lithography tools and advanced wafer capacity are scalable constraints that should be alleviated within two to three years—but he did not address packaging concentration.

Even with new domestic packaging capacity coming online by 2027–2028 through Amkor and Intel, the U.S. will remain far behind Taiwan's scale and proprietary technology leadership for the foreseeable future. The central question is whether the U.S. is willing to make the multi-decade, multi-hundred-billion-dollar commitment required to achieve true packaging sovereignty—or whether it will settle for symbolic progress and accept continued dependence on Taiwan, gambling that geopolitical stability will hold.

For now, America's AI boom—and its defense technology—still runs through Taiwan, leaving a question the CHIPS Act has not answered: If we can't finish the chips here, what have we actually secured?