Verb conjugation of "anular" in Spanish

My daugther was crying all night and we did not know why. We assume that she is getting into the terrible two age and wants to give us a hard time. We love her so much and do not get upset by that.
But we need to asked ourselves why we actually are built in such a way that we so easily dislike others and build stereotypes. What leads to such behavior even in well educated individuals?
This province was only one mile away from China and one could see the border control. From there it was a bus ride up the hill, about an hour or so passed and we arrived at our final destination.