Answer is D. The topsoil and grasses were blown away because of severe drought
Thomas Hobbes
In this state, every person has a natural right to do anything one thinks necessary for preserving one's own life, and life is "solitary, poor, nasty, brutish, and short" (Leviathan, Chapters XIII–XIV).
The statements are not described but the conditions of the railroads in the United States after the civil war was not good.
At that time, the president was Abraham Lincoln, and he compromised that the government would subsidize the cost to build a trascontinental railroad. After the war ended railroad construction in the West and South continued for decades.
There were 2 main railway companies after the Civil War: the Central Pacific Railroad and the Union Pacific Railroad. Encouraged by government who provided funds, between 1865 and 1869, the Central Pacific laid 690 miles of track and the Union Pacific 1,087 miles.
Government helped the railway companies by giving them land, as they wanted American to expand west as cities were overcrowded in the east.
In Virginia in the 1600s, Anthony Johnson secured his freedom from indentured servitude, acquired land, and became a respected member of his community. Elizabeth Key successfully appealed to the colony’s legal system to set her free after she had been wrongfully enslaved. By the 1700s, the laws and customs of Virginia had begun to distinguish black people from white people, making it impossible for most Virginians of African descent to do what Johnson and Key had done.