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I think it was so long ago
People first crossed over the land bridge during the ice age around 30,000 years ago.
No, the towers house the bridge lift equipment.
The Sydney Harbour Bridge opened in March 1932. In March 2015, it will have been 83 years since e bridge was opened.
Most likely following game and a more conducive climate.
Looking at a world map, you can see a part in the corner where Asia almost touches Alaska. Long ago, the water was all frozen, and water levels fell. So, there was a "bridge" into Alaska. They just went across that.
They were a tribe who crossed the Beringia Bridge from Asia to America a long time ago. They lived in the Southwest.
Asians crossed the Bering Strait into Alaska about 25,000 years ago.
5,000 years ago
Some caveman millenia ago discovered that you could fell a tree across a creek. That was the first man-made bridge. Since there are no historical records from that long ago, we cannot say who that person (or persons) was.
Probably around 10,000 years ago.
Barton became a teacher when she was seventeen and taught in ... the Red Cross helps the people just like Clara Barton did a long time ago. so there you have it:)