The ancient people were moving west.
The bridge that you are referring to was called the Bering land bridge which is now the Bering Strait. During the Ice age, though this area was covered in ice which made the sea levels drop and emerged the land bridge, the land bridge was covered with grasses and low shrubs which provided food for the mammoth, horses, caribou, and bison. It is believed that the ancient people followed these grazing animals from beringia (which is now SIberia) and into America, they are believed to be the first inhabitants of America. Over time the weather got warmer and the glaciers started melting and the bridge started disappearing into what we now call the Bering strait this all happened about 11,600 years ago
There were a significant amount of military dictatorships in Africa during the 1970s. These, for instance, were Nigeria, Ethiopia, ect. I am highly sure that military governments were the most present in Africa during this time period. Therefore, D is probably the right answer.
That is because the vast majority of Native Americans died in the period. This was mostly due to diseases that the Europeans brought with them and against which they didn't have the immunity. Many also died in wars and in reservations, but mostly due to diseases. The Europeans flourished and developed successful colonies, which led to the modern times.
In 1903, the United States negotiated a treaty with Colombia that granted the United States the right to construct and operate a canal for 100 years within a zone six-miles wide across Panama.
