he has excited domestic insurrection among us and has endeavored to bring on the inhabitants of out frontiers the merciless indian savages whose known rule of warfare is an undistinguished destruction of all ages sexes and condition

Whats the british king being accused of?

In this passage from the Declaration of Independence, the king is accused of supporting rebellion among the slaves and Native Americans.

http://www.founding.com/the_declaration_of_i/pageID.2457/default.asp

The king encouraged slaves and Native Americans to rebel against the colonists.

The British king is being accused of inciting domestic insurrection and attempting to bring Native American tribes to attack the frontiers of the American colonies. The specific accusation is that he is actively encouraging and supporting both internal rebellion and external attacks against the colonists. This accusation suggests that the British king is deliberately trying to destabilize the colonies and cause harm to the people living on the American frontier.