What role did the West play in crucial issues of the period as the tariff internal improvements and the expansion of slavery?

The West played a major role in the crucial issues of this American period. The tariff protected industries from the British surplus goods and helped transfer goods from the west to the east. The West expansion contributed to internal improvements with the construction of roads. It also helped interstate trade, which would be protected by the tariff. With the topic of slave expansion, the West broadened the admission into the new states, whether they were a slave or free state.