How many miles of railroad tracks or there by 1900s

6. why did louis xvi call a meeting of the estates-general in 1789? how long had it been since such a meeting had been called?

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

Who was the last of the "good empire" a: commodus c: marcus aurelius b: trajan d: julius caesar