Muckrakers, such as Upton Sinclair and Jacob Riis, helped to expose problems related to O assimilation of immigrants
industrialization and urbanization
O conserving the environment
O railroads and western expansion

the awenser wuold be slaves

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

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.

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv