Tibet in Old American Geographic Documents.
I'd like to present the US document published in 1828.
This is the one reason why China cannot keep hidden universal knowledge forever.
Before I newly introduce the document of 1828, I must refer to the another document published in 1830 which was already introduced the previous day by myself and the one which can be the evidence that there is not a single document which can prove "Tibet is NOT a part of China".
We can learn a lot from these sort of documentations.
The image underneath is cited from the old US document, "Elements of geography, ancient and modern" published in 1828.
Elements of geography, ancient and modern : with an atlas
by Worcester, Joseph E. (Joseph Emerson), 1784-1865
Publisher Boston : Hilliard, Grey, Little, and Wilkins
Book contributor University of California Libraries
Location of the Document
We can also find the sentence about about Okinawa in the book.