In MY opinion the most important transportation invention was the train.
I dont know exactly but the new deal lead to Japan getting mad and attacking Hawaii which was the spark that lead to ww2
Congress passed the Civil Rights Act of 1964 using this Constitutional authority and this was a c) protection of state's citizens. The Civil Rights Act of 1964 is defined as a "landmark piece of civil rights legislation in the United States that outlawed discrimination based on race, color, religion, sex, or national origin."
They exported Grain in the late 1900th century
The Republican Party was formed from the Whig Party, since the main issue tying most Whigs together was slavery. The Republican ideology soon became about abolition, as well as federal power over the states.