Some other things that happened three years ago:

The original Brexit referendum,

Trump had his first year in office -seeing the US leave the Paris climate change agreement

Khloe Kardashian was pregnant - apparently,

The Manchester Bombings

China Banned 42 categories of plastic in its foreign waste policy

Doctor Who became a real life woman

The Me Too movement began

Carter Wilkerson’s became the most retweeted person of all time in his request for a year of free chicken nuggets from Wendy’s.