Crash?
19,780.20 when Trump took office
23,860.46 end of trading 2-8-18
+ 4,080.26
That's a net 20.6% increase to-date/ Pretty good.
Obama's increase was 24.6% over the same period. Even better.
[DJI = 9908 on 8 Feb 2010; 7949 on 20 Jan 2009]
So, you might want to ask yourself if there were any factors in the past couple of months that drove the market down, such as economic impact of tax law on national debt, removal of Janet Yellin, falling dollar, rising interest rates.