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golden age
It was the "Golden Age."
About 25 to 40 thousand years ago, the Ice Age began and the land bridge between present day Alaska and Asia formed.
it was formed millions of years ago
It was the "Golden Age."
The Golden Age
Egypt is a transcontinental country spanning the northeast corner of Africa and southwest corner of Asia, making it an Afro-Asiatic country via a land bridge formed by the Sinai Peninsula.
A natural structure is formed entirely by nature, whilst a building, bridge, etc. is a manufactured structure.
I suppose you meant the period between the transition of Xia and Shang dynasties.
10,000 bc
I suppose you meant the period between the transition of Xia and Shang dynasties.
It is believed that the native Americans came over land and ice that formed a bridge between Alaska and Siberia or 2. by some boats.