History is so quirky - Crazy Far Rights in Europe made America go Left but Britain go Right.
The Wallace doctrine basically stated that any genocide of attempt of Genocide would lead to the United States going to war with the county that tried it. When the British Empire completely buckled under the weight in the rebellions of 64' this led the US, then led by President Bob Kennedy of the Progressives into an never-ending Crusade in Sub-saharan Africa. The British, then led by Prime Minister Bevan of the RDSLP (Radical Democratic Socialist and Labour Party) were dragged into it, the US demanding the aid for symbolic purposes and fulfulling their 'colonial debt'.
Of course, Bevan had only been elected in 64', so he was spending the budget on massive Socialist Programs, which sent it into Deficit. The Americans gave him a bottomless pot of gold to spend to get the armed forces up to scratch.
Bevan probably would have let the Defence forces decay, but with the American funds he was able to make the British Forces 2nd best in the world, after America and just ahead of Nazi Germany - of course we all know though, he spent much more of domestic programs - known now as 'The Artificial Socialist State' which kept the RDSLP in power for 25 years.
When Racist regime in South Africa was sorted out in 71', the Alliance of America, South Africa, Australia and Britain has spent the last 35 years driving around policing Africa and South East Asia - More effectively when India and Indonesia were finally on side in 80s.