The Legal Right To Stand Your Ground
In many regions, you have no legal obligation to run away from a dangerous encounter. You may use deadly force to defend yourself, provided you are in a place where you have a lawful right to be.
This legal principle overturns the traditional duty to retreat, which often required individuals to attempt a safe escape before using force. Lawmakers designed these rules to protect people from being penalized for defending their own safety during an unexpected attack. Because these laws vary significantly by state, a person's rights can change entirely just by crossing a border. It remains one of the most debated topics in modern self-defense law.
Source: Stand-your-ground law