Spending is bound to go up because of population growth and inflation. It would be more appropriate to look at spending and taxation as a portion of GDP (which also goes up with population and inflation). Spending:
Taxation was going up a bit relative to GDP towards the end of Obama’s term (which is why the deficit was shrinking), but taxation is now going down (hence the deficit is rising again under Trump).
https://tradingeconomics.com/united-states/government-spendi...
It has been going down since the Great Recession (44% in 2009 vs. 38% in 2016). Taxation:
https://fred.stlouisfed.org/series/FYFRGDA188S
Taxation was going up a bit relative to GDP towards the end of Obama’s term (which is why the deficit was shrinking), but taxation is now going down (hence the deficit is rising again under Trump).