It’s totally forgotten how IS was running rampant under Obama but quickly subdued as soon as Trump came in.
Obama aligned the US with Sunni Arab Jihadi’s to overthrow Assad. He probably told Turkey they could have it all.
When President Trump took office he cut the Jihadi’s loose and partnered with the YPG/YPJ Kurds in Syria. From that point things have gone very well ending ISIS. It has cost more than 2,000 lives of our SDF allies. And I think something like 900 were lost trying to defend the Turk takeover of Efrin (Turks employed 3,000 ISIS plus many Nusra (al Qaeda) Terrorists in the FSA)