Yellow Magic , not Yellowcake , marked the shift from Pax Britannica to Pax Americana

I argue that Pax Britannica lingered on into the end of WWII , but as soft culturally-economic power, not hard military- economic power.

The British brand had a lot of strength against the America brand - it still had a lot of moral capital.

Not the least because Britain had stood all alone defending the world's Four Freedoms while isolationist America had yawned like a bored bystander watching a schoolyard bully beat up a pre-schooler.

Winston Churchill had led that fight but in the Fall of 1942 - unknown to most - his party, the Tories, had thrown away most of the global good will , all in an instant.

Tragically for Pax Americana , "Could we keep the Bomb a secret ?" misheard as "Should we keep the Bomb a secret?"

Recipe for a world tragedy :

In one bowl : top American scientists , privy to the details of the Manhattan Project and well aware of the long ongoing world-wide scientific quest for the atom's inner secrets.

In the other bowl : the top American political leadership, extremely well versed in conventional military thought , economic hardball and winning elections (but who knew rather less than zero about the current hot topics in the scientific world.)

Mix the two at a top secret meeting and stand back.

The most powerful figure in wartime America vs an unknown dying doctor

It wasn't a fair fight : the unknown dying doctor won.

It was a classic Hollywood-type story of powerless, selfless , agape-good triumphing over all-powerful evil of the most banal kind.