What were the issues that the US colonists had against King George? Why were they upset?

Taxation without Representation

Explanation:

After the French and Indian War, Great Britian was in millions of shillings of debt. They had to tax the colonists extra on goods used everyday such as sugar, tea, glass, paint, and paper. Many shops had to close down.

Answer: The King and Parliament believed they had the right to tax the colonies ... Many colonists felt that they should not pay these taxes, because they were passed in England by Parliament, not by their own colonial governments. They protested, saying that these taxes violated their rights as British citizens.

Basically, The King and Parliament taxed the colonists against their will, and the colonists believed this was not right and protested against it.