Both words are cut from the very same cloth but they do not mean the same thing.
When we look at Black's Law 2nd, it defines Liberty as;
"Freedom; exemption from extraneous control. The power of the will, in its moral freedom, to follow the dictates of its unrestricted choice, and to direct the external acts of the individual without restraint, coercion, or control from other persons."
and it defines Freedom as;
"The state of being free; liberty; self-determination; absence of restraint; the opposite of slavery. The power of acting, in the character of a moral personality, according to the dictates of the will, without other check, hindrance, or prohibition than such as may be imposed by just and necessary laws and the duties of social life.The prevalence, in the government and Constitution of a country, of such a system of laws and institutions as secure civil liberty to the individual citizen."
It defines liberty as being freedom; and defines freedom as being liberty. Thus having the individual believing they mean the same thing. This is not the case.
However, as we can see from Black's Law's definition of liberty, it tells us, "exemption from extraneous control." That means it is not controlled by an outside force. That is exactly what freedom is, thus it would be the definition of freedom and not liberty.
When a sailor moors his vessel to a pier, does that sailor get freedom or liberty? The sailor gets liberty. why is this?
In order for a sailor to receive his liberty, he must first fill out a request chit; requesting liberty. Let's say the sailor hands that request chit to his Senior Chief Petty Officer and this officer approves it.
That Senior Chief Petty Officer is the external force granting the sailor liberty. Do we or should we fill out a request chit for freedom? That is an emphatic NO. Liberty comes with conditions; you have to first ask for permission and in the case of the sailor, he has to return.
"Freedom is "NOT" controlled by an external force whereas liberty "IS" controlled by an external force. Liberty always comes with conditions."
So it stands to reason that people should be fighting for freedom and not liber