Which technology was a product of the arms race following world war ii?

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.

How did the united states obtained the purchase of floridia to extand its frontiers to the pacific ocean

Which physical feature minimizes population density in northern africa?