The rapid population growth during the california gold rush gradually led to
a. a renewed interest in westward expansion and land treaties with native americans.
b. the rebuilding of old ghost towns and the need for telegraph lines.
c. new business ventures in food, clothing, mining and demands for new forms of transportation.
d. a spurt of political activity that led to popular sovereignty.

your answer would be (a)

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

yes they have. but is this a true false question? if it is, the answer is true.

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