With regard to Crypto, if the dollar falls it means US citizens will get less crypto for their money, so they may decide to keep what they have, knowing it is worth more today than it was yesterday, or they try to keep all of their transactions off-dollar as much as possible. The same would apply internationally, the rest of the world can see that they can get more dollars for their money today than they could yesterday, so US export trade would increase while the value of the dollar lowers.