A quick search on Google will say this below on the purchasing power of dollar over decades
Since 1972, it has fallen by 99 percent against gold and lost 90 percent of purchasing power of real goods and services.
Imagine if US Dollar were a cryptocurrency, it would have been one of the most shitcoins ever.
A currency that loses 99% of its purchasing power vs. gold in 52 years? Think twice about what you say. There are shitcoins that lose that purchasing power in 52 days, not to mention those that lose it all and the value is 0, so there is no way the dollar would be the worst shitcoin. It is not for nothing that people from countries with weak currencies tend to buy dollars, because devaluation is much slower than in most countries on the planet.