Although Japan is a Buddhist country it was among the last countries in Asia to adopt the Buddhist religion.  Buddhism was officially introduced in Japan by the Baekje Kingdom in Korea in 538 A.D. It was not until 40 years later under Prince Shotoka in 604 A.D. that Buddhism was made the official religion in Japan. Although Buddhism made its advent in the world and all over Asia it was  nearly 1100 years after the  advent of the Buddha Shakymuni that the Japanese adopted Buddhism.  When Nichiren Daishonin was born of February 16, 1222 Buddhism has been around over 1700 years. Ancient Buddhism emerged from African empires in Asia and Buddhism declined in India when the last Black Empire the Gupta empire fell to Whites who call themselves "Aryans."  The Aryans set up the cast system in India and they hated and made sure they destroyed  Buddhism and its Buddhist temples.

Buddhism is a religion that started in neither Japan, or China, but is a religion that is practiced by millions of people in Asia. It is historically clear that Buddhism started in the Continent of India. The first inhabitants of India were Black people who migrated from Ethiopia some 50,000 years ago. These Blacks from Africa are known today as Dravidians. There are two types of Blacks from Africa.  One had broad features and wooly hair (Nubian) and the other had the aquiline nose and straight hair, both were early descendents from Africa.  These early decendents from Africa created perhaps the first civilizations of mankind and if they  were not the first they certainly was one of the first civilizations of mankind.  The civilization was called the Indus Valley civilization, in the area today known as Pakistan.
The Indus River Valley civilization, which built the city of Mohenjo Daro (shown here), arose in what is now Pakistan about 4,500 years ago. Mohenjo Daro and its sister city, Harappa, each had some 40,000 residents at their peak in 2500 B.C. It was the Aryans who came into India and destroyed this civilization.

Originally India was "all Black or what we call the Indus Valley Civilization.  We come to understand India when the Whites came into India they call themselves "Aryans." This is thousands of years before the  Japanese learn about Buddhism.

In approximately 1,500 BC the Indus Valley civilization was forever changed by the migration of the Aryan’s, originating from the Caucasus Mountains and central Asia. The indigenous people are referred to as Dravidians are Naga people were displaced southward, and the Indus Valley culture was no more, giving way to the Vedic era of India’s history. In plain and simple terms there were some warrior class of White people who came into the Indus Valley civilization and changed India. 

These Aryans were not a high culture and they did not have a written language.  Let's put this plain and simple these Whites were "warriors" and they "kicked Ass."  What they brought into India was a racist system called the "Cast System." What you had was a Civilized people and an Un-Civilized people. The Dravidians or the Nagas had to fight the Aryans.  What took place in India was a war of the Blacks and Whites that took place for over 1000 years.  In India they call these wars the  three great epics: Ramayana, Mahabharata and the Upanishada.  So not to make this thing complicated and put in plain and simple words this is how the Whites introduced Brahmanism into India.  They call this Hinduism, but it was Brahminism and for the 1st time in India the Whites  bring in the "Cast System."

  The caste system consisted of 4 castes: Brahmins (Priests), Kshatriyas (Warriors and Rulers), Vaisyas (Merchants) and the Shudras (Labourers and Farmers). During the early time it was acceptable for people to move between the castes. A member of the Shudras caste, if adopted by a sage, could even become a Priest. Even though the fair skinned Aryans existed side by side with the dark skinned Dravidians, there was frequent competition and fighting for fertile lands. By about 800 BC most of Northern India was ruled by the Aryans.

Please understand that this war in India went on for over 1000 years.  There were periods of peace inner marriage and a lot was going on.  One of the things that happen over time was the Aryans learning the written language from the Blacks. The Whites called this written Language Sanskrit. The language of Sanskrit evolved from the Ethiopian language of "Geeze." We learn this in the 1833 book the Analacypsis written by British Historian Godfrey Higgins.

Before seventh century B.C., i.e. before the rise of the Buddha, all the ksatriya dynasties of Mahabharata times had been ruined, shattered and destroyed. They were replaced on one side by the Dravidas - Naagas in Taxilla, Patalpuri, Udyanpuri, Padmawati, Bhogpuri, Nagpur, Anga or Champa, and in various places in the south; and on the other side by ganas or republics of vratyas like Licchavis, Mallas, Moriyas etc. [Jyoti Prasad Jain, quoted by Kosare, p. 42]

In India a great empire emerged via the son of  Sutra or Black woman in India called Mahapadma Nanda.    He was described as  "the destroyer of all the "Kshatriyas " or  warriors.   This  Black King   was credited to stopping Alexander's eastern advance with an Army of 80,000, horses, 200,000 foot soldiers, 800 chariots and 6000 elephants. The center of his dynasty was Magadha in what is not East Indian state of Bihar which was then and now dominated by Black people. #Note that Mahavira Jain's founder was born in Bihar in 599 B.C.E. during the time of Shakyamuni. Shakyamuni not only traveled to Bihar but attained enlightenment there.

The Nadas were succeeded by Mauryan Dynasty which was also of Black origin. The dynasty's founder Chandragupta Maurya stepped in and conquered the Nanda forces when Alexander withdrew. The Mauryas ruled what was at that time the largest empire in the world. Chandragta was succeeded by his son Bindusara around 300 B.C. E.. Bindusara was succeeded by his son , Ashoka one of the great kings in India's long history. It was Buddhism under Black King Ashoka that spread Buddhist teaching through out Asia, Europe and Africa.  What is important to know is the fact that Buddhism from India was practice in Ancient Africa. Godfrey Higgins point out that there was Buddhism practiced in Africa before Shakymuni Buddha of India.  The Ancient Egyptians practice Buddhism and Historian Godfrey Higgins point out that Hermes Trismegistus was the Elder Buddha of Ethiopia.  The historian Higgins point out that the ancient Egyptians were Buddhist and that Buddhism was once practiced all over the world.  Higgins point out that "Stone Henge" in England was an Ancient Buddhist Temple.  Higgins tell us about the Gymnosophist or the Buddhist in Ancient Egypt. 
Shakyamuni came from a Black warrior tribe located in what is the southern region of Nepal where the Shaka  clan has built a Republic. The Republic had ten Chiefs and the Chiefs chose a leader they called King.  Shakya was the name of his tribe and the title "Muni" (meaning sage). Shakyamuni's father's name was  Suddhodana and their capital city was called Kapilavastu. Shakyamuni was also known as Prince Siddhartha  who exhibited wisdom from infancy, and he was skilled in learning as well as the martial arts. When  Shakyamuni left on his path to attain Buddhahood has father dispathed five ascetics to go with Prince  Siddhartha. First they trained under two ascetics and this did not lead to enlightenment. Afterwards for the  next twelve years he pursued every religious practice imaginable and one day he rebelled from the religious  ascetics and sat down, dug inside and attained enlightenment at the age of thirty years old. We Nichiren Shoshu Buddhist understand the "Lotus Sutra" that reveals Shakyamuni's true Enlightenment.
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