Wind patterns, ocean currents, proximity to large bodies of water (i.e. seas and oceans), and elevation all impact climate patterns through a variety of factors. These factors largely impact the flow of energy and heat from the sun across the Earth's surface through processes of convection. For example the "Jet Stream" in the United States is a wind pattern that carries air and weather patterns across the United States and its flow shifts directions depending on seasons. Another is the Gulf Stream which brings warm currents from the Caribbean and Central American up the American coast and out into the Atlantic ocean warming the temperatures of the coastal water ways and also impacting the climate of the land near it.
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Black codes were restrictive laws designed to limit the freedom of African Americans and ensure their availability as a cheap labor force after slavery was abolished during the Civil War. Though the Union victory had given some 4 million enslaved people their freedom, the question of freed blacks’ status in the postwar South was still very much unresolved. Under black codes, many states required Black people to sign yearly labor contracts; if they refused, they risked being arrested, fined and forced into unpaid labor. Outrage over black codes helped undermine support for President Andrew Johnson and the Republican Party.
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In the cartoon, the literacy test appears as an insurmountable barrier to a family of immigrants. Uncle Sam peers out over the barrier, a flag behind him ironically proclaiming "the land of the free." The law foreshadowed the 1924 National Origins Act, which ended the years of mass immigration.
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