Societies are believed to have emerged in north america as early as

There is an ongoing debate about the emerging of Societies in North America. What most experts conclude is that it was about 40,000 years ago that the first human migrations were able to move from the Bering Land Bridge  when the sea level was low enough for them to walk to north America, however; this is just a theory. Some other experts think that using primitive boats people were able to migrate down the pacific coast to south America and then moved north.

Explanation:

Archaeologist have found many artifacts that indicate that people in north America have populated that area since more that 20,000 years ago but is hard to determine an specific year or period of time.

nuclear fission produces the atomic bomb, a weapon of mass destruction that uses power released by the splitting of atomic nuclei the fighting in iwo jima and okinawa affected the allies' pacific strategy because truman decided to drop the atomic bomb on mainland japan.

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.