yes US invasion in iraq in 2003 is a major contributor for the rise of ISIS or ISIL
Reason
US policy at that time regarding
1)Iraqi army (most of the ISIS militants are ex army officials of iraq
2)Desolation of political structure
3)Instability in society
4)No clear agenda for the restoration of iraqi national structure after war
5)Severe blow backs from people against US invasion
6)Shia Sunny conflicts
7)Lack of leadership