If we take a look at the weekly SPX chart from 2015-2016 we can see a potential playing out again in 2018-now. SPX hit an all time high resistance and got rejected a few times to form an .The head of the inv found support at the 200-week MA before forming the right shoulder. The right shoulder found support at the 100-week MA and finally broke the market structure to form new all time highs before retesting support (former resistance), which is a very typical market move. After retesting this support it took off new new highs once again.
On the fundamentals side, with the trade talks expecting to produce common ground and positive results, we might get the push we need to finally break this resistance .
So far, this is playing out perfectly.