How did steam engines affect coal production?

Steam Engine and Coal Mining. Coal was central to the development of the steam engine and in turn, the steam engine dramatically increased the efficiency of coal mining. Before the steam engine, shallow bell pits followed a seam of coal along the surface, which were abandoned as the coal was extracted.

Explanation:

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.