However, the men of the West have been become docile and weak - and now easily succumb to the effluvium cast upon them by hands of adversaries unseen in their midst.
And now history repeats itself once again: another invading force marching into the Westerner's sphere. This time, however, instead of fighting back the invaders, our people make the spectacle of laying themselves prostrate in-front of the incoming army, offering everything up to them.
From graves of water and tombs of man
The hollow weight of history
Desiccated and blowing free"
The real cause - the reason for the collapse of Empires - is the decline of man's spirit and the racial soul.
Before civilization was built, the earliest of our ancestors to walk this Earth sought only to survive. Each day was a battle for food, shelter from the elements, clothing to stay warm, and the duty of protecting family, tribe, and village. This way of life left no room for weakness within man, and those that failed to overcome this struggle perished.
At the end of his lifespan, a man should have completed the power process throughout his life (goal, effort, achievement of goal), and have achieved all that was capable of himself. He should have met his wife, raised a healthy generation of children, instilling into them his values - the same values of the tribe. His children will have given him grandchildren, of which his wisdom will be passed down to. He will have served the tribe, knowing that through which time will see the continuation of positive growth of his own offspring and his people.
A man was also in full control of his destiny in this state, free to forge his own path in the power process towards attaining a higher state of being - each generation building on the wisdom, discoveries, and technologies of the previous generation. The collective of these men and women would form families; families into tribes; tribes formed into villages; villages into regions; finally, regions into nations. Over millennia, these people belonging to the same ancestral root stock would have finally established a territory steeped in the history of the race (a variation of the root stock).
In this cradle rests the commonalities required for a nation - a common genetic heritage; a wellspring from which flows the nation's language, customs, mental and physical traits, their moral constitution, spiritual beliefs, institutions, and in the final stages, their arts. These physical and psychological traits form the national character, a soul which is as unchanging as the anatomy of the race itself. Within the arts dwells the pinnacle of racial expression, as the racial soul permeates all internal and external manifestations. Architecture, sculpture, painting, literature, music, poetry, theatre, and, if time allows, the development and refinement of the sciences.
Whilst I plan to eventually go into all of the above in detail, we will for now focus on the last stage of racial maturity: the arts.
With the race's triumph over the elements, beast, and necessity, civilization has now arisen. A collective of similar peoples being akin to an organism, the birth of civilization is the organism's maturity into adulthood, having passed the trials of youth and adolescence. Having been formed from the harsh forces of nature, man is generally in a stronger state of being, with a clearer head on his shoulders, caring for what's needed and caring not for what's superfluous. As long as each generation is vigilant in passing down its core values to the next, the civilization will thrive.
Become dust in the wake of the hymn
Mighty kingdoms rise, but they all will fall
No more than a breath on the wind"
It is in these final stages of a civilization where the arts more than anything else increase in continued development, where the germs of collapse and decline are already borne. As civilization progresses, man's participation in the power process is minimized; that being goals essential for day-to-day life are stripped from him - leaving him with less to accomplish, and thus less participation in the power process leads him feeling bored, demoralized, and frustrated. It is in this stage that man may now spend more time fulfilling surrogate activities, which are non-essential goals he may set up to fulfill. These are activities which are not pertinent to immediate survival, such as studying plant or animal life, music, poetry, etc. However, before we move further, we need to make a comparison.
Primitive man valued strength, faith, and family - living his life in a militaristic manner, with his years consisting of daily tasks which further the life goals of survival, reproduction, and passing down an inheritance (wisdom, knowledge, and technology) to his progeny. It is in his later years, when his days are near their end and frailty prevents him from fulfilling the primary goals and duties that were once his but have now become the responsibility of his offspring, where he now has time for secondary goals, or surrogate activities.
In contrast, a man in a highly civilized society has more leisure time for the pursuit of surrogate activities, allowing for the further refinement of civilization – and at an ever quickening rate as primary goals are easier to attain and the autonomy required to achieve them is removed. However, these surrogate activities generally do not fully satisfy man. As leisure increases, decadence always follows, and consequently morality decreases. The arts of a people therefore reflect the health of a society. As long as the arts reinforce the founding values, moral constitution, spiritual beliefs, etc., and edify the racial soul of the people, their civilization will continue to last. However, if decadence makes its way into the arts (over-extravagance and superfluous use of language in literature; degeneration and perversion of the visual arts; effeminization of poetry and music, etc.), then collapse is assuredly around the bend. 
Vast cycles unfold across the span of æons
Colossal keeps consumed and left as burial mounds
And even stars will fade into empyrean shrouds"
The people, now with virtues lying dormant and vices in bloom, no longer possess the ideal of their ancestors - the greatness and continued positive development of their progeny, their nation. Listless and rootless, the people are now at the mercy of invading or immigrating forces with a strong ideal, and the nation becomes an immense caravansary, and no longer the nation of the founding race. Whilst for a time it may still appear to be alive, the nation is like an animated corpse - it appears to be alive, but its soul has long been dead.
The echoed verses state soft the toll:
"In the wake, all is dust"
Those who have safeguarded their racial soul and kept vigilant depart to start anew. The old society will sustain itself on the dust of old gods for a time, decadent and egocentric ; soon this amalgamation of the races will descend into the abyss and the civilization they inherited and mimicked for a short while will collapse. The heights of what once was, desiccated and swallowed by the great maw of time, and empty halls sing a hollow fall as the winds of the earth blow over its tomb.
A breach was sealed but a host was torn, raised this wall only to fall
Bones ground into sands of the shore
A voice reborn and a voice was shorn, the vice of centuries of life
Must we make this sacrifice?"
"The life of a people and all the manifestations of its civilization are merely the reflection of its soul, the visible signs of something invisible but very real. Exterior events are only the apparent surface of the hidden framework by which they are determined.
"It is neither chance nor exterior circumstances, and still less political institutions, that play the fundamental role in the history of a people. It is more especially the character of a people that fashions its destiny.
"The various elements of the civilization of a people being only the outwards signs of its mental constitution, the expression of certain modes of feeling and thinking peculiar to a people, these elements cannot be transmitted unchanged to peoples of a different mental constitution : all that can be transmitted is the exterior, superficial, and unimportant forms."
[1, 3, 5, 6, 7]. - Passages from Caladan Brood's "Wild Autumn Wind" and "To Walk the Ashes of Dead Empires".
. Power Process as described in "Industrial Society and Its Future" by Theodore Kaczynski.
. As mentioned in Stoic philosophy, best surmised within Lucius Annaeus Seneca's letters to Lucilius.
. From "The Psychology of Peoples" by Gustave Le Bon