The Dred Scott vase invented a constitutional right to make it so that slaves couldn’t testify in court, as they were “property” and not people.
In general, history is the recorded story of the interaction between "ideas" "people" and "patterns", since it is the way in which people act and make decisions that influences their collective history.
The development of railroads was one of the most important phenomena of the Industrial Revolution. Trains provided supplies and equipment and a lifeline of the army. Trains made a big impact on the citizens. Railroads were visible symbols of industry and modernity during the Civil War.
D. Allowing Texas into the Union would upset the balance of slave and free states in Congress. Though it soon became a state since Manifest Destiny was a very popular idea at the time.
