The largest group of immigrants to the united states during the 1840s and 1850s came from ireland, which was then in the throes of the great potato famine.

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.

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