Which accomplishment did otis, sullivan, roebling, and olmstead share

50 do you think civilian (nonmilitary) control of the military is an important part of u.s. democracy? why or why not? what are the advantages to this system? are there disadvantages?

Two books are used to model tectonic plates

Which of the following was used only once, to ratify the 21st amendment (repealing prohibition)? a.three-fourths of both houses of congress. b.three-fourths of the state legislature approved it. c.two-thirds of the state legislature approved it. d.ratifying conventions in three-fourths of the states approve it.