Answer:
A. The Navajos distinguished themselves by using their language as a code the Japanese could not break.
Explanation:
During World War 2, there were famous Navajos known as the Navajo Code Talkers that helped use their language to transport secret message without the Japanese interfering.
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Hmm, there were several triggering events that promoted westward expansion of the United States. Victory in war over Mexico (1848) gave the US new lands in the west. A treaty with Britain (also in 1848) gave the US sole possession of some formerly disputed Oregon territory lands also. Plus, in 1848, gold was discovered in California (land newly in US possession after that Mexican war treaty), so that prodded westward expansion too. Perhaps those are the initial "turning points" you're looking for. The completion of the Transcontinental Railroad in 1869 sure helped the process as it was underway, as well.
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The federal government supported the interests of big businesses over the interests of labor unions.
Unions became popular during the Gilded Age in the US during an industrial boom. The government supported the owners of business during this period and practiced free market capitalism.
During the Gilded Age, the government took a policy of free-market or laissez-faire capitalism. This means the government did not interfere or create regulation of the economic system. They tended to support the practices of corporations because they were wealthy and had power. Unions demanded higher wages, government regulation, and better working conditions. All of these demands went against the thinking of the time and would have cost the government money and the favor of the powerful in the country.