Has there been an outright sale of national territory in the recent past? Why was the transfer of territory (allodial title) between sovereign entities via financial purchase more common in the past (no large scale examples I can find within the last 25 years)?
This submission has been removed because it involves current events. To keep from discussion of politics, we have a 20-year rule here. You may want to try /r/ask_politics or another current-events focused sub.