The conflict by which the US achieved independence from Britain. An achievement of which the natives are fiercely proud, and ever since the respective states have been fiercely independent of each other.
I've a niggling feeling that there's a problem somewhere within that statement, possibly hinging on the meaning of 'independence', but that whereof one should not speak, thereof one should be silent. So to reiterate, the American War of Independence was the conflict by which the US achieved independence from Britain. America and Britain. Independent of each other.