Use the information in the table to answer the question that follows. Event
Lancaster Turnpike opened
First voyage of the Clermont steamship
National Road expanded to the Ohio River
Erie Canal completed
Construction on the Baltimore & Ohio railroad begun
Year
1795
1807
1818
1825
1828
What best explains the importance of these events for the development of the United States?
They aided industrialization by making it easier to ship goods and raw materials.
They contributed to expansion by enabling Lewis and Clark to explore the West.
They helped to end slavery by establishing ways for people to escape to the North.
They encouraged immigration by providing cheap transportation to reach the country.