That has long been a mystery to me as well. How can the dollar stay relatively strong when its underpinnings keep getting much worse. With Federal Government debt levels, including unfunded liabilities, getting dramatically bigger the dollar ought to be declining in value.
Theory says it will eventually, but when?

Meanwhile gold and silver are at their lowest points in years, ostensibly because of the "strength" of the USD.
I can understand how the USD under Trump is strengthening against other fiat currencies but against gold and silver I suspect manipulation. The financial condition of the US balance sheet is as bad as it has ever been in history except perhaps after the revolution or mid civil war.

Out of the frying pan and into the fire.
Yes, all things are relative and only relative to a worthless currency would bitcoin temporarily qualify.