AI investment is becoming the core of a new round of capital expenditure for American companies. Alphabet, Amazon, Meta, Microsoft, and Oracle are expected to reach approximately $1.1 trillion in AI capital expenditure by 2027, accounting for 3.2% of U.S. GDP, potentially surpassing defense spending for the first time in the same period. Looking at the trend, tech giants are entering a new round of "arms race," and computing power, data centers, and AI infrastructure remain the most certain areas of investment for the coming years.