The union had a higher population, more factories and larger railroad system. How would each of these things be a military advantage during the civil war?

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

confederacy: supported slavery, believed states should be able to nullify federal laws, supported low tariffs

union: everything else

the correct answwer is d