The peak of European power and dominance over the planet was in the middle of the 19th century. The recession from this peak was due to internal -rather than external- forces, although I'd submit that these were not inevitable. This period saw the rise of social organizations which -satisfied with conquering the planet- saw the next project to perfect the morality of their nations, eventually leading to civil rights and independence movements.
The mistaken ideal of moral perfection has led to multiculturalism and massive economic opportunity loses: the slippery slope has proven all too real as voting rights have led to a creep towards all manner of dubious rights (E.G. being called by a preferred pronoun.) From a cultural perspective, not every country is equal, and technological advances allowed Europe to dominate the world, before morality encouraged to give up their holdings.
A central dogma of Conservatism is that society and the individual should be moral, but the most dominant empires at their peak, throughout history were far from moral... and it is this contradiction which I consider to be the blindspot which will doom efforts towards the preservation of White European culture. Society doesn't fall apart because it lacks a defined morality, but because it dogmatically clings to ideals which no longer apply to its current situation.
The argument against a White identity is political correctness, although this is not politically motivated, at all, but moral. The solution to this isn't liberalism, conservatism or libertarianism, but in a pragmatic version of libertinism (De Sade failed to resolve the contradiction where the goals of numerous libertines would clash- there have to be winners and losers.)
