i was thinking after New Vegas the next 2 best places are Chicago (gang land) and New york city

what do you guys think should fallout 5 still resign in the U.S. of A or go foreign and if some where else where what city would be best to explore after new Vegas?

New Vegas is not Fallout 4, presumably at some point in the future Bethesda will develop Fallout 4.

As for possible locations, we have an http://www.gamesas.com/index.php?/topic/1108234-official-fallout-4-location-suggestions/ for this. Chicago and New York City are both popular choices, although Chicago has already been featured in a Fallout game so I don't know how likely it is to show up in a new one. Personally I'm hoping to see the Commonwealth and the Institute.