RE:RE:RE:Russia Takes Gold For Oil/\Deposits Flee Banks
You can measure the USD against a basket of other major currencies - the USD index - but the best way to tell USD's true value is to look at how many more dollars it cost now to buy the same amount of goods.
It now takes $1,930 to buy an ounce of gold. 40 years ago about $400 would buy an ounce of gold.
https://www.macrotrends.net/1333/historical-gold-prices-100-year-chart
Similarily with all other tangible assets, the USD has depreciated.