Answer:
12. It sped up the delivery of news and information, promoting the development of a market economy.
13. Members of the Electoral College were elected by popular vote, not their state legislatures.
14. Henry Clay threw his support to Adams when the contest went to the House of Representatives.
Step-by-step explanation:
12. By making long-distance communication faster and less expensive, the telegraph increased the efficiency and size of markets, facilitating the Industrial Revolution and accelerating the growth of the American economy.
13. Popular voting had no part in the presidential elections before the 1820s. By 1828, when Andrew Jackson was elected as president, that method had had almost entirely changed into the modern democratic system.
14. Henry Clay´s open support won Adams the subsequent contingent election in the House of Representatives.