Which us region is the most important for agriculture and mining?
a.
the rocky mountains
b.
the coastal plains
c.
the great basin
d.
the great plains

D.  the Great Plains

Explanation:

The Great Plains is a high and wide plateau that extends east of the Rocky Mountains, on the American continent, and covers the Mexican state of Coahuila, the Americans of New Mexico, Texas, Oklahoma, Colorado, Kansas, Nebraska, Wyoming, Montana, South Dakota and North Dakota. In Canada, they extend through the Canadian provinces of Alberta, Saskatchewan and Manitoba. Throughout the region there are many farms dedicated to agriculture and livestock. It also has large deposits of oil and coal. Every 25 years or so, the region suffers droughts and devastating sandstorms. The Great Plains are the westernmost of North America, and extend eastward to the Appalachian plateau.

i do believe its (d) it allowed the government to offer pioneers sixty acres of western land if they lived on it and made improvements to it.

explanation: signed into law in may 1862, the homestead act opened up settlement in the western united states, allowing any american, including freed slaves, to put in a claim for up to 160 free acres of federal land. by the end of the civil war, 15,000 homestead claims had been established, and more followed in the postwar years