He then went on to become the longest-serving war president [1]:

> On May 6, with eight months left before he vacates the White House, Mr. Obama passed a somber, little-noticed milestone: He has now been at war longer than Mr. Bush, or any other American president.

It wasn't all inherited conflicts. He also oversaw the 2011 intervention in Libya, the 2014 involvement in Syria, and the 2014 re-intervention in Iraq after having withdrawn troops in 2011.

[1]: NYT: https://archive.is/diXo5