It was the construction of the "railroad system" in the United States that was most important in encouraging the growth of the cattle industry during the late 1800s, since this allowed for the swift and relatively cheap transport of meat and other goods.
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A mixed economy means that part of an economy is managed by the government while part of it is left with the free market.
Its development factors involve allowing private enterprise to run most of the business and then in the later part government can come in for providing public services or regulation of private business etc.
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an example of the president having an involvement in civic life might be throwing the first pitch at a baseball game. Involvement in Civic life implies participation in and support of the ordinary life of the citizens of the country. The other answers are all concerned with the promotion of the president or their policies or relate to international diplomacy.
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Explanation: