(Apologies in advance for skewing off-topic):
I don't think its "dominance" has much to do with its 'rich' 'culture and history...' or as much as you think that it does.
One needs only to look at the historically repititious musical patterns in history to realise that you are incorrect.
The US is an infant country in comparison to various countries throughout Europe. This is reflected in (overall) musical and artistic evolution and complexity, as well as cultural evolution including religious and mythology aspects. I speak not just in terms of Black Metal output, but also in terms of the most important music of all: Western Art Music.
From the Medieval Period (476AD, although highly influenced by the Middle-East) right through to the Romantic Period ending approx 1910, covering a timeline of one and a half millennia, Europe held the throne to musical evolution and supremacy, founded by culture which in the 5th century was already rich in religion, mythology and art.
The rise of the modern age of humanity, namely that of the industrial revolution, swung the world's focus from that of Europe to America, where popular music has held focus since, a mere period of only approximately 100 years.
Taking into account the above influences, there is
no way that USBM or US metal for that matter will EVER touch the level produced by the countries of Europe, simply because of a lesser cultural depth.
This is not to say that America is not capable of producing good BM, but rather that it has less historical and cultural resources to
draw from: foundations are everything. And it is not only ideological or lyrical aspects which these characteristics influence, it is also the very notes and structure of the music itself.
Thus this leads me back to the very nature of repitition I spoke of earlier: as Europe did with Western Art Music, it leads and evolves now and has for almost three decades with Metal, chiefly Doom and Black.