Pennsylvania was the third-largest coal-producing state in the nation , and it was the second-largest coal exporter to foreign markets.
Pennsylvania, endowed with extensive fossil energy resources, is a leading East Coast supplier of coal, natural gas, electricity, and refined petroleum products to its own industries and to the nation.
The Appalachian Mountains in the state hold rich coal resources and run diagonally southwest to northeast through Pennsylvania, dividing the Ohio River valley in the west from the Susquehanna and Delaware River valleys in the east.
The Marcellus Shale, the largest U.S. natural gas field, follows the arc of the mountains and underlies about three-fifths of the state.
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Employment. According to Lesley Hall, an historian and research fellow at the Wellcome Library, “the biggest changes brought by the war were women moving into work, taking up jobs that men had left because they had been called up.” Between 1914 and 1918, an estimated two million women replaced men in employment.
You are right, Thomas Jefferson did write it. according to a book that I read, Benjamin Franklin helped him write it and advised him
Answer:
b. cross-sectional comparative research
Explanation:
This is the term that best describes the comparison of data from one time period between two or more nations. Cross-sectional comparative research is very useful to historians as it allows them to better understand the conditions that existed around the world during a particular time period. It also allows them to understand how location and context influenced the experiences of people of particular historical events.