Many may not remember this, but the events of the first Avengers film are actually the catalyst for the entire Netflix universe. Daredevil picks with Hell's Kitchen recovering and rebuilding after the Chitauri attack. The criminal underground is in a state of turmoil as well.
They never call it the time that aliens
attacked the city and a bunch of guys in flashy costumes with weird powers beat them up. They simply refer to it as "the incident." Not only is it a huge plot point during Daredevil's first season, but it's been mentioned in some form in almost every series since.
Many long time fans wish the MCU would drop this facade already. For some though, it helps keep this TV universe darker and more grounded.