They overall helped the Continental Army in some (or many) battles like the Battle of Saratoga
Answer: Social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they live.
(looked some information on this topic up to help you a bit better)
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The industrial revolution lead to major economic changes and growth. Due to the rise of new technology, many job opportunities were available. Immigrants especially those who were entering the US during the 1800's, were able to find work on railroads. Eventually as more modern day technology was proposed to society, individuals were able to benefit in their work field and at home. For example the light bulb, allowed homes to run with electricity and the telephone made long distance communication much simpler. These new inventions allowed the nation to develop a stronger military and navy, which improves the nations economy during times of war.