The correct answers are:
Better transportation
War.
Modern technology.
Assembly line production.
Embargo Act of 1807.
The period connecting the end of the War of 1812 and the Civil War was a time of fast development in transportation, accelerated growth of factories, and important expansion of new technology to expand agricultural production.
The Embargo Act of 1807 was a general embargo on all foreign countries established by the United States Congress against Great Britain and France throughout the Napoleonic Wars.