Here’s why Venezuelans just voted to annex most of Guyana.
"As a matter of international law, Maduro has no leg to stand on. "
Setting aside the fact that "international law" is pretty much BS, this statement is still not true.
"On the basis of a map published in 1840, the British would claim a border 170 miles northwest of that."
They literally paid someone to draw an agreeable border and then made a claim on that basis. About as flimsy a claim as one can imagine.
"What happened next has been a subject of controversy in Venezuela ever since."
"The dispute was more or less forgotten for sixty-odd years"
Both of those things can't be true. In fact further evidence came out in the 40s that the panel was in fact rigged. It is quite understandable that the government would decline to accept the panel's recommendations.