How did the railroads impact the relationship between eastern cities and the great plains?

What is one example of trench warfare ?

What was going on with south asia before europeans came ?

Plz which of the following provisions of the compromise of 1850 was designed to appeal to slave states? a. congress passed a strict fugitive slave law. b. the slave trade was banned in washington dc. c. texas agreed to give away some of its land so that the territory would be available for future states. d. california was admitted to the union as a free state.