Briefly explain why ONE of the following options most clearly marks the beginning of the sectional crisis that led to the outbreak of the Civil War.

How do astronomers measure the amount of dark matter in the universe

Analyze and evaluate the motivation and the rationale behind western expansion through the louisiana purchase that took hold in the united states at the start of the 19th century (long essay question)

The torque output of an engine is usually measured in the units of a rpm b bhp c foot pounds d feet per pound