What is Independence?

Legal Definition
A state of perfect irresponsibility to any superior; the United States are free and independent of all earthly power.

2. Independence may be divided into political and natural independence. By the former is to be understood that we have contracted no tie except those which flow from the three great natural rights of safety, liberty and property. The latter consists in the power of being able to enjoy a permanent well-being, whatever may be the disposition of those from whom we call ourselves independent. In that sense a nation may be independent with regard to most people, but not independent of the whole world. Vide on of Independence.
-- Bouviers Law Dictionary
Legal Definition
The state or condition of being free from dependence, subjection or control. Political independence is the attribute of a nation or slate which is entirely autonomous, and not subject to the government, control or dictation of any exterior power.
-- Black's Law Dictionary