Why do we say "This land is your land"?

Meaning:

Self explanatory

Background:

Apparently this saying originates as the title of the well-known song written and performed in 1956 by folk singer and guitarist Woody Guthrie which begins:

This land is your land, this land is my land
From California to the New York Island
From the Redwood Forest to the Gulf Stream waters
This land was made for you and me.

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