For decades or longer, the United States has been the leading architect of the post-war order – a nation that rebuilt Europe, shaped global institutions and led alliances around the world.

Today, that leadership faces a different test. Trade disputes, strained alliances, and shifting foreign policies have prompted America's allies to ask a harder question: Can the US still be trusted?

As America marks its 250th anniversary, is the world still waiting for Washington to write the script? What does that mean for America's global leadership – and for the future of the international order?