Awnser: In Athenian direct democracy all citizens voted and in an American representative democracy citizens vote for representatives to vote for them. ... All citizens voted in an ancient Athenian democracy and in a modern American democracy citizens vote for representatives to vote for them.
Explanation:
The points above detail how agrarian societies in the early days of America were affected by the domestication of plants and animals. Many of those agrarian societies have now transitioned to become industrial societies, mainly due to commercial and industrial revolution.
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I believe it was because it was a key source in fueling trains. That was important because the railroads were the key source in transportation of goods and communication between the states.