The First Continental Congress organized a boycott of British goods. The Second Continental Congress declared independence from Britain.
Before the development of money as a medium, goods and services were exchanged through a barter system.
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There may be several reasons why there are trees on the roof of the White House. First that comes to mind is for aesthetic reasons - they make the roof seem more beautiful and appealing. Other than that, the reason may be practical - to hide the windows of the White House, so that no one can see what's happening there.