In 1929 the world economy crash isint only because of the USA. A lot of country where involved in Canada there whas a really hot period with no rain, as well for other countrys so a lot of people lost there job + less food. The stock market and speculation in north america was really intensse in those time wich dint help...
T: If you already heard of the entropy theory it says that any system will always increasse in entropy wich I think his good enough to say that eventualy our world will be destroyed in some kind of way...