They brought back specimen samples
I don't really see your question here but here is some background info President Lincoln.Abraham Lincoln<span> (born</span><span> February 12, 1809 – April 15, 1865) was an American politician and lawyer who served as the </span>16th President of the United States<span> from March 1861 until </span>his assassination in April 1865<span>. Lincoln led the United States through its </span>Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis.<span> In doing so, he preserved the </span>Union<span>, paved the way to the abolition of slavery, strengthened the federal government, and modernized the economy.</span>
The answer is: C
This is because the graph indicates the sharp decline of the rural population, due to in large part to the increase in urbanization and the ever-growing industrialization of the United States throughout the decades.
As such we can analyze that, as the years go by the population trends to move to urban areas in place of rural ones.
I forget 5
6 is MARYland (the u.s. state )
7 is new Jersey also us state
8 is the Carolinas us states ( north and south)
