Final answer:
The American System, the transportation revolution, and Manifest Destiny were three important factors contributing to the economic growth of the United States in the period 1815-1860.
Step-by-step explanation:
In the period 1815-1860, three factors contributed significantly to the economic growth of the United States:
The American System: Proposed by Henry Clay, the American System aimed to promote economic growth through protective tariffs, a national bank, and internal improvements like roads and canals. These measures stimulated domestic industries, supported trade, and improved transportation, all of which contributed to economic growth.
The transportation revolution: The development of railroads and canals greatly improved transportation and connectivity across the country. This facilitated the movement of goods, allowed for the expansion of regional and distant markets, and boosted economic growth.
Manifest Destiny: The belief in Manifest Destiny, the expansion of the United States from coast to coast, drove westward migration and territorial expansion. This expansion opened up new lands for agriculture, access to natural resources, and increased trade, all of which fueled economic growth.
Each of these factors played a vital role in contributing to the economic growth of the United States during the period 1815-1860.