Soviet communism falls much earlier leading to several consequences.
The whole Commie scare idea becomes laughable in the US
The us disengages from Europe and anywhere it doesnt have direct economic interests.
Since there is no fear theyd be a ppuppet of Moscow, the communists do better in France, and they form the government.
French colonies are no longer 'colonies', they are 'fraternal socialist republics'. Of course the difference isnt very visible to the average Vietnamese or Algerian. However, nationalist agitation is now not 'legitimate anti-imperialist' exptression, but is now 'antiprogressive criminal activity'.
The US doesnt care, theyve been burnt once by anticommunist hysteria, theyre not going to fall for that line again. Besides, the French are to busy attempting to suppress 'counterrevolutionary activity' to be able to export their ideology very effectively.
However, Britain is close at hand, and France, or french inspired activist groups, try to export the revolution. In particular a group calling itself Le Main Noir makes a couple of attempts to assassinate royalty. In fact, one agent named Gabriel Prince gets a shot off at Prince Charles.
France, isolated on the world stage, feels it has to build a 'force de frappe', which means that Britain, no longer under the US nuclear umbrella, needs to develop its own Bomb.
The two nations glare at each other across the channel.
How's that?