The coal miners were underpaid Eastern Europeans who were told not to complain about their substandard and dangerous working conditons.
The disaster shook the people of Calumet and surrounding communities in the copper-rich Keweenaw region of Michigan's Upper Peninsula.
When it comes to the transformation of the global economy from high-carbon, polluting energy sources to a more sustainable future, the U.S. risks falling behind.
1907 was a particularly troubling year in West Virginia, during which a total of 3,242 people were killed in mining accidents.
The typhoon destroyed several hospitals, along with homes, schools, power lines, bridges and virtually everything else.
There are some 6,000-plus lobster boat workers in Maine that best fit Victor Hugo's general description of them more than a century ago - toilers of the sea.
"After several weeks of nearly around-the-clock negotiations, I believe we have reached something that can be taken to the membership for ratification."
More than 4,500 members and supporters of the United Mine Workers marched and rallied in downtown St. Louis on May 21.
Only nine of the men working in the mine at the time of the disaster were able to escape, after one of them got to safety and returned with a rescue team and equipment.
The late environmentalist, Sen. Gaylord Nelson, D-Wis., founded Earth Day as an environmental teach-in first held on April 22, 1970.