<span>For the answer to the question above, the main actions between the main adversaries, for which the world should be grateful for, was that an all out nuclear war did not happen.
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Option A is the right answer, that 'since few people understood it, it was a difficult code to break'.
Code Talkers in the 20th century were the people who used the Navajo language as the method of coded communication during wartime. This language Navajo helped U.S Marine Corps to transmit coded messages without any breach with the help of U.S natives, who used their expertise in this language. Because of its pronunciation, Navajo language was difficult to break.
In fact, the U.S Marine Corps concluded that at the beginning of the second World War, the Navajo language was known to even less "than thirty non-Navajos".
<span>For one, the territory system installed by the Northwest Ordinance would remain the standard for admittance to Union throughout the continental United States throughout the era of expansion; also, the system of popular sovereignty over slavery would become commonplace, up until its influence played a role in the start of the Civil War in the 1860's.</span>
Answer:
medicine, mathematics, and physics
Explanation:
The century saw significant advancements in the practice of medicine, mathematics, and physics; the development of biological taxonomy; a new understanding of magnetism and electricity; and the maturation of chemistry as a discipline, which established the foundations of modern chemistry.
