The War of 1812 affected Manifest Destiny as it slowed industrial expansion for 2 years. Option C is correct.
During the period of war, most of the manufacturing companies were required to halt their normal operations and requested to contribute the use of their machinaries to produce war-related items, including weapons, vehicles parts, parts for food supplies, communication device, etc.
Manifest Destiny held that the United States was destined by God to expand its dominion and spread democracy and capitalism across the entire North American continent.
