Due to the railroads, american settlers were able to travel west in larger numbers. how did this migration impact american indians

I believe the answer is: American Indians' way of life changed because buffalo herds were destroyed for commercial markets.

The migration make a lot of people able to settle to the territory that previously been occupied by Americna Indians. This force some of them to leave the territory or change their way of life to conform and adapt to the new way of life created by the settlers.

the answer is b: an economic crisis throughout the country.

the correct answer is:   "   3.6 % " .

          →   the unemployment rate is:   " 3.6 % " .

explanation:

to calculate the "unemployment rate" :

the "unemployment rate"   =

  [# of people unemployed] /   [working age population]   * 100 %   ;

                =   [9 million] / [250 million]     *   100 % ;

    →     note:   the units of "million" cancel out;

                    since:   " {million} / {million} = 1 " ;

                =   (9 / 250)   * 100 %   ;

                = 0.036 * 100 % ;

                =   3.6 %

answer:   the unemployment rate is:   " 3.6 % " .