In his first 100 days back in office, President Donald Trump has launched a sweeping overhaul of U.S. foreign policy, unsettling allies and redrawing the contours of global diplomacy. Embracing an aggressive "America First" doctrine, Trump has imposed broad tariffs, slashed foreign aid, and distanced the U.S. from traditional alliances, prompting concerns about the stability of the international order.

Key actions include the initiation of a global tariff war, with the U.S. imposing significant duties on imports, affecting trade relations worldwide. Trump has also reduced U.S. foreign aid and criticized NATO allies, while expressing a desire to annex territories like Greenland and make Canada the 51st state. His administration's approach to the Ukraine conflict, favoring Russia's narrative, has further strained relations with European partners.

These moves have led allies to reconsider their defense and foreign policies. European nations are debating increased military spending, while countries like Canada are seeking closer ties with Europe. In Asia, South Korea and Japan are reassessing their security strategies, and some nations are exploring stronger economic relationships with China.

Critics warn that Trump's policies risk causing lasting damage to U.S. credibility and global alliances. While the administration argues that these actions are necessary for peace and prosperity, the international community remains wary of the potential for increased instability and the erosion of the post-World War II rules-based order.