Which of the following led to the most sectional strife over slavery in the first half of the 19th century?

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:

agree with wilson that weakening the treaty would threaten world peace.