Read the passage from history of the united states, by charles and mary beard. as necessary to mechanical industry as steel and steam power was the great market, spread over a wide and diversified area and knit together by efficient means of transportation. this service was supplied to industry by the steamship, which began its career on the hudson in 1807; by the canals, of which the erie, opened in 1825, was the most noteworthy; and by the railways, which came into practical operation about 1830. the railways followed the same paths [as the canals]. by 1860, new york had rail connections with chicago and st. louis—one of the routes running through the hudson and mohawk valleys and along the great lakes, the other through philadelphia and pennsylvania and across the rich wheat fields of ohio, indiana, and illinois. baltimore, not to be outdone by her two rivals, reached out over the mountains for the western trade and in 1857 had trains running into st. louis.

The options of the question are a) steel. B) industry’s need for a market. c) the Erie canal system. d) the railways.

The correct answer is C) the Erie canal system.  

In a summary of the passage, the central trend is the Erie canal system.

The passage contains an introduction that serves as a context when it refers to “the Steel and Steam power as a good market to mechanical industry.” And then, it leads to the central idea when it diversified to allow more efficient means of transportation, like the Canals for navigation. The passage refers to the Ships of Steam that navigated through the Hudson in 1807, using the Erie canal, part of the system of Canals in the state of New York.

20 years ago

explanation:

a)scientists

explanation:

the national defense education act had two main goals. the first one was to provide personal that was oriented to defense, including scholars, engineering students and so on. the other goal was to provide financial assistance for the students who would be enrolling at colleges and universities in the 1960s.