They considered them unfair.
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They are upset because Great Britain starts taxing the colonist to pay for the war. I am pretty sure that is the answer. ;)
I'm not sure if this is the one you looking for but "Taxation without Representation"
The British were upset at the colonists because the rejected many of their acts that they enforced. British did not treat the colonies fairly and only saw them as a way to make money. (The mercantile theory) However, the colonists thought that the acts that the British Parlament enforced were outrageous, especially the Stamp Act and the Tea Act. The Stamp Act resulted in a famous phrase created by a colonist, "No taxation without representation!" The Tea Act was hated by the colonies so much that it resulted in a well known event called the Boston Tea Party.
They colonist were promised a new start in life if they came.
The colonist settle at the fort orange(Albany) to the new Amsterdam(new York) wich the Hudson River was in between.