I just returned from Japan and have found a lot of interesting information like Japanese archipelago has been traced to prehistoric times
Japanese archipelago? is that in the northern region?
No it means the islands that makes up Japan. Have you heard  of the Jōmon period?
oh ok.  no, never heard of Jomon period
It was during the first millennium BC. It's when Japan started using new to that time technologies from other parts of the world. 
is that period during the feudal times and shogans? or I am thinking about another period of time
first known written reference to Japan was recorded in the Chinese "Book of Han" in the first century AD. Between the fourth century and the ninth century, Japan's many kingdoms and tribes gradually came to be unified under a centralized government, nominally controlled by the Emperor. This imperial dynasty continues to reign over Japan. In 794, a new imperial capital was established at Heian-kyō (modern Kyoto), marking the beginning of the Heian period, which lasted until 1185. The Heian period is considered a golden
History of Japan
The history of Japan covers Japan and its relation to the world. It is characterized by isolationist, semi-open and expansionist periods.
Please see the era classifications for details of each era.
The very first human habitation in the Japanese archipelago has been traced to prehistoric times around 30,000 BCE. The Jōmon period, named after its "cord-marked" pottery, was followed by the Yayoi in the first millennium BC when new technologies were introduced from continental Asia. During this period, the