Also, not sure why people are disagreeing with my literal quotes from the BBC.
Well, for one, you're completely misrepresenting the site you linked to.
You're trying to argue that because Britain was a signatory to the Atlantic charter, this constituted:
a) The acceptance by Britain of a concrete commitment to decolonisation.
b) The establishment of a general subordinate relationship between Britain and the United States in which the latter assumed "leadership" over the former.
Your singe piece of evidence for this is a reference to a BBC website which describes the negotiation of the Atlantic Charter.
"Roosevelt added to Churchill's version of the Charter, broadening its interpretation. He was effectively forcing the British Empire into granting independence to its colonies."
So let's look int this shall we:
Firstly, as the site itself points out, the Atlantic Charter was not a treaty or binding document, it was a press release which spelled out the shared ideological goals of the USA and Great Britain regarding their shared overall objectives. The charter has about as much legal weight as Sean Murray saying that there would be multiplayer in No Man's Sky, less in fact because at least Murray could be taken to court.
Secondly, here is the text of the Atlantic Charter press release: http://www.nato.int/cps/en/natohq/official_texts_16912.htm
As you can see, Roosevelt's amendments did not make it into the final document. As you can see, the document is a compromise between churchill's original wording and Roosevelt's ammendment. Neither made it in intact. This is normal in negotiations, the goal is to reach an acceptable compromise.
Thirdly, how on earth are you getting broad statements about the hierarchical position of countries from a set of private conversations between two leaders regarding the wording of a press release? Just.. in what universe is that a sensible basis for making these kinds of judgements? Where in the BBC website you linked to does it evidence that connection?
Oh, and people are disagreeing with you because you still haven't substantiated anything.