Pennsylvania's population boom during the 1800s was due largely in part to a.) the number of slaughterhouses that opened in the northern regions. b.) the coal industry, which began organizing in the early 1800s. c.) cotton that was shipped from the southern states. d.) factories emerging in the cities of pennsylvania.

The correct answer is B)

Pennsylvania’s population boom was largely due to the coal industry, which began organizing in the early 1800s. Pennsylvania was also a leader in the production of iron, leather, ships, lumber, textiles, and glass

here you go hope it heps "horace mann"

answer; slavery should be outlawed in the new country, was part of the initial draft of the declaration of independence, but not part of the final