Can a Canadian get out of the Canadian Market without moving out of Canada?

Is it possible to completely isolate our financial investments from the Canadian Market while continuing to live in Canada? Let’s say, the Canadian Economy crumbles to the point that banks declare bankruptcy, how could our savings/investments remain untouched by this kind of disaster? I realize I can open a trade account through a Canadian Institution and buy US stocks. But can I open a trade account through a US institution without being a US citizen?

Any options for a locked in Canadian LIRA? Or would this be destined to go down with the economy?