Imagine a world where the Soviet Union still exists and dominates a Communist empire stretching from the Bay of Biscay to the Shores of Japan. A world where Southern Asia is dominated by the Indo-Britannic Raj and there are only five nations in the whole of the Americas. President Hillary Clinton sits in the White House, trying to hold together a country still recovering from the Civil War of the seventies. A world of These United States in Confederation.
POD: The US Constitution is never developed. Instead, the USA remains under the Articles of Confederation until the American Civil War of the 1970s, whereby the Articles are drastically amended.