Which of the following statement(s) is true?
a. women held positions on the railroad.
b. the number of women who worked on the railroad more than quadrupled between 1870 and 1890.
c. only 62 women were classified as railroad workers in 1870.
d. all of the above

Why was the united nations established

Ahistorian who compares the expansion of political systems to the expansion of economic systems is organizing history by

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste