D) the Slave trade emerged as the dominant form of commerce around the Gulf of Guinea in the 15th and 16th century.It became a important commerce in the 17th century
A) increased trade and prosperity
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The US Constitution is the supreme law of the land.
The correct answer is :
The invention of barbed wire contributed to the demise of the open range system.
In the winter of 1886–87 the open range industry was ruined as hundreds of thousands of cattle perished and homesteaders took over and fenced the lands with barbed wire.
By 1890 there was little remaining of the open range system.
The Union victory in the Civil War in 1865 may have given some 4 million slaves their freedom, but the process of rebuilding the South during the Reconstruction period (1865-1877) introduced a new set of significant challenges.
