If you made pro-ISIS materials, you can expect the US government to closely monitor you, and quite likely attempt to entrap you.[1]
If you made large numbers of pro-ISIS videos, even if you were a US citizen, there would be a strong possibility that you would be killed [2]
[1] https://www.cleveland.com/metro/2018/07/fbi_arrest_of_clevel...
[2]https://www.nytimes.com/2015/08/30/magazine/the-lessons-of-a...