The american dream has proven to be
Answer:
for this one I'm not as sure, I'm pretty sure it is probably Singapore
edit: Incase anyone sees this in the future, it's correct
One of the most significant causes of the decline of the Byzantine Empire was the "Crusades," since it was the Crusades launched by people in the western empires that eventually led to the Capture of Constantinople.
They didn't need immigrant employees as they already had many people doing the work. Eventually they would, however.
it getting worse because more pollution