For Discussion: What are or would affluent people be doing to protect their wealth in the event of a major global crisis specifically affecting the US economy?

Without devolving into political mudslinging can we talk about what people in America could do to protect their wealth and investments if a major catastrophe strikes the US economy? Hypothetically and for instance maybe invading a nato ally that triggers a cascade of negative consequences, predictable or unpredictable. Do wealthy people abandon all positions \~stocks, bonds … and retreat to cash? Would the dollar be worthless anyway? Gold? Real estate?