I apologize for not providing a reference, but I recall reading a Russian designer, I think he had something to do with Mig-29, while talking about Mirage 2000, said that a delta wing is essentially a compromise. He mentioned some technical challenge faced by the designers and if they cannot overcome they fall for a delta. It overcomes something but leaves something else to be desired.
Can somebody please shed some light on it? I am just an enthusiast.
One thing is for sure, no US fighter is a delta.