This is a result of USA not investing into foreign soil as much as they used to, USA banks and investors have so much money that it is sometimes smarter to put that money into other countries to make more money compared to domestic investments, those countries see that money coming in consistently and position themselves accordingly and when the money stops coming they fail to react and get into a trouble which results with more losses for everyone involved. So, world crisis is not something shocking to anyone who checks world finance instead of just look at wall street.
I think it's funny that if the USA is investing in a country, say in Africa or in the Middle East, it is considered by some people as an infringement on the sovereignty with all that it implies: establishing a puppet government, depriving the country of natural resources and blah blah blah. But if the USA is not investing in a less economically developed country it is still somehow a bad thing (and in some cases, from the viewpoint of the same people, which is even more funny imo).