On November 1, 1957, traffic officially opened on the far-reaching Mackinac Bridge. That was the culmination of 70 years of talking and dreaming about a bridge acrossthe Straits of Mackinac, of discouraging attempts for legislative and congressional approval, of efforts to raise the funds, and finally of a three-year construction program necessary for the world's longest and costliest (to date) suspension bridge.Michigan's greatest...