The steam engine replaced horse drawn railroad cars. The steam engine was a revolutionary invention. It would forever change transportation.
The philosophical roots of the Declaration of Independence came from Enlightenment thinkers such as John Locke, who argued that the government should serve the people and be chosen by the people. The effect of the Declaration was that the colonies officially separated from Britain.
Natural and unnatural laws
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Journeymen are certified and have already completed their apprenticeship. Therefore, they're allowed to start and run independent businesses.
Therefore, 1 is the answer.
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D.a political system with all economic and political power resting in the hands of the central government