I compleatly agree that humans evolved from the blacks of Africa:
These racial patterns make up what is called a "life-history" or "reproductive strategy." The traits evolved together to meet the trials of life-survival, growth, and reproduction. Race differences make sense in terms of human evolution. Modern humans evolved in Africa about 200,000 years ago. Africans and non-Africans then split about 110,000 years ago. Orientals and Whites split about 40,000 years ago.
The further north people went "Out of Africa," the more evolution selected for larger brains, slower growth rates, greater longevity, lower hormone levels, less sexual potency, less aggression, and less impulsivity. Advanced planning, self-control, and rule-following are cultural manifestations of these gene-based evolutionary strategies. Surviving in cold environments required increased intelligence and larger brains. The wider hips of white and Asian women evolved to allow them to give birth to larger brained babies.
http://www.lrainc.com/swtaboo/stalkers/jpr_insight.html
I find it hard to agree with your other theory's, to belive that blacks were at one time the most advanced people on earth only to somehow revert to now the most primitive people on earth does not make sence.
EGYPT
FACT #62: Ancient Egypt was founded and built by Mediterranean Caucasians as far back as 4500 B.C. Egypt's period of greatness was from 3400 B.C. to 1800 B.C. and was characterized by its amazing architecture, pyramids, temples, and mastery of mathematics and engineering, the remnants of which are still evident today. The White Egyptians pioneered medicine, chemistry, astronomy, and law; In many cases, their achievements remain unequalled. (37) (39) (21)
FACT #63: But, about 3400 B.C. Egypt civilization began to spread up the Nile River, bringing it in close contact with the black Nubians to the south. Soon they were using Blacks for slave labor and Egypt became history's first melting pot. (39) (10) (14)
FACT # 64: In time the infusion of Negro blood worked itself up from the bottom of Egyptian society. The slaves were eventually freed, received political equality, and took posts of authority in government. (10) (37)
FACT #65: By the time of King Tut (1370-1352 B.C.) even the ruling classes had been mongrelized and Egypt began a tailspin downward. Today, the once-mighty Egypt is very much a Third World country, having lost its art, its medicine, its architectural ability, and its position in world affairs. (10) (37)
The absurd notion that Ancient Egypt was a product of Negro ingenuity is now being widely disseminated in the schools. Though scholars know this is a blatant lie, they justify the deception by assuming it will boost the "self-esteem" of Black children.
More facts:
http://www.powow.com/radio88/wb.htm