How did the growth of the railroad supply and demand for natural resources in the United States?

Railroads helped connect the West to the East. It made travel to the West easier for emigrants whose only options before were wagon trails. Railroads often owned the right-of-way along the tracks, thus facilitating the sale of land to potential homeowners. ... Railroads also connected the West to the East economically.

Explanation:

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 % " .