He determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers.
The correct option is: "Rapid industrialization"
The twentieth century was characterized by advances in technology, medicine and science; the end of slavery in the so-called underdeveloped countries; the liberation of women in most of the Western countries; but more than anything because of the growing development of the industry, converting several countries, including the United States, into world powers.
Neil howe,william strauss' ,Gary webb
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Hey there!
A <u>conquistador</u> is someone who conquers territory especially one of Hispanic background during the conquests of America, Mexico, and Peru.
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Your answer should be ‘the rapid settlement of the American West’, since according to senate.gov, it reads ‘ | The rapid settlement of the western territories | in the 1850s convinced most members of Congress of the need for efficient rail transport to the Pacific coast,’.