Question

which of the following contributed most to the forced removal of native americans from the great plains from 1867 to 1890? (ssush12a,c) the building of the trans - continental railroad the building of new canals

Explanation:

The Trans-Continental railroad, completed in 1869, opened up the Great Plains to massive westward migration of white settlers, increased U.S. government military presence in the region to protect rail lines and settlers, and directly encroached on Native American lands. In contrast, canal building was a major development in the early-to-mid 19th century (pre-1867) and focused on eastern waterways, not the Great Plains.

Answer:

the building of the Trans-Continental railroad