The authors of the "Preliminary Statement of the Association of Manhattan District Scientists" mention the “grave danger that lies ahead” with the weapon they have developed. What is one example of a danger that they mention in the text?

What is the purpose of the system of checks and balances

How did the technology of the late 1800s affect the growth of cities? select one: a. cities were able to expand outward because of additions to railroads. b. electric streetcars enabled the wealthy city dwellers to move to the first suburbs. c. advances in steel and metal technology allowed for the development of the skyscraper, which allowed cities to grow upwards. d. all of these are correct.

The 15th amendment to the u.s. constitution, ratified in 1870, deals with what issue? a. prohibition of alcohol b. voting c. declaring war d. free speech