Progressives believed that

a) the government should follow a policy of social darwinism.

b) industrialization and urbanization caused many of society’s problems.

c) muckraking journalists should be put in jail.

The answer is B because  

Progressives believed that the growth of industries and the growth of cities caused social problems for our society.

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the answer to number 5 is fort sumter

as general terms,  indian territory,  the indian territories, or  indian country  describe an evolving land area set aside by the  united states government  for the relocation of  native americans  who held  aboriginal title  to their land. in general, the tribes ceded land they occupied in exchange for  land grants  in 1803. the concept of an indian territory was an outcome of the 18th- and 19th-century policy of  indian removal. after the  civil war(1861–1865), the policy of the government was one of  assimilation.