Interesting map, below is a link with more details, actually more of the strong economies don't have much of a restriction for cash transactions than your map implies (without more details of the different colour meanings at least) http://www.europe-consommateurs.eu/...PDFs/PDF_EN/Limit_for_cash_payments_in_EU.pdf
http://www.europe-consommateurs.eu/en/consumer-topics/buying-of-goods-and-services/cash-payment-limitations/ That's your map I think, if you click on the specific countries on your map you will get the (exact) same information as in the link I posted earlier.
Some of you need to get a grip. "if usa goes under", what does that even mean? If it means the US disappeared, the US economy somehow had a complete epic fail, anything of that sort and protecting yourself with more than one brokerage and some gold and water rights is going to be the least of your concerns, especially if you happen to live in the USA! And really, there are car dealers anywhere in the developed world that now happily accept many thousands of dollars in cash in a suitcase for you to buy your new car now, regardless of government controls? This is tin hat territory folks, better use your cash while you can to buy bunker supplies.
I don't know how it works in the US, but where I live they ask you where the money came from when you import your car from "anywhere in the developped world". Even buying a +100 000$ dollar car or a condo can result in a fiscal investigation where I live.You should also declare every year enough to cover your living expenses. I know it because I had this question already. So government controls, even if you think they don't. Like NSA reads information that you think they don't read.
Surely diversifying your assets, means that you should plan to mitigate semi-probable scenarios, where you have a negative life expectancy. We're traders here, and that's great while the system works. Stating: 'The system will never fail' is naked punting; ill advised.