Protecting your US funds

I am 74 years old and healthy. I plan to move to Mexico hopefully within the year. I will apply for a residency based on financial solvency. My income will be Social Security and my IRA disbursements. I am afraid of what may happen in the United States and of losing my investments and or even my Social Security. Have others thought about what they’re going to do to protect their investment funds? I know financially it’s a stupid idea, but I’ve even thought of moving all my investments in funds and stocks to CDs and money markets. Do others have a fear of the economy in the US blowing up and losing all your assets?