美国经济隐藏大患，哈佛学者罕见警告危机，马斯克直言一招解决

Group 1 - The U.S. is facing a dual challenge of escalating debt and a significant shift in its global strategy, indicating deep-seated interests and real dilemmas [1][3] - Current public debt in the U.S. has reached 99% of GDP, projected to exceed 107% by 2029, marking a historical record since World War II [6] - The U.S. is experiencing severe debt repayment pressures, with weekly repayments exceeding $11 billion, accounting for 15% of federal spending [6] Group 2 - Various experts propose different solutions to the debt crisis, reflecting a societal confusion about the future direction of the U.S. [14] - Jeffrey Frankel suggests fiscal tightening as the only viable solution, while Elon Musk advocates for technological optimism through AI and robotics to address the debt issue [16][20] - The new National Security Strategy indicates a major shift in U.S. foreign policy, prioritizing national interests and practical diplomacy over global hegemony [24][30] Group 3 - The strategy emphasizes a reduction in military commitments abroad, particularly in Europe, and a focus on threats in the Western Hemisphere [26][28] - The report also highlights a shift in U.S.-China relations, moving from systemic competition to a focus on balanced economic relations [30] - The intertwining of the debt crisis and strategic adjustments presents unprecedented challenges for the U.S., with potential global repercussions [31][33]