As early as 2013, Western powers have been rooting for the balkanization of Syria as the best possible outcome of the war tearing apart the country since 2011.
Since the war against Syria is significant in this period of imperialism, watching how it was led by the US, imperialist proxies and their so-called allies, one can fully understand that the war against the Syrian Arab Republic has been decades in the making.
Throughout history, the imperialist powers have been facilitating and empowering the most intolerant, bigoted ideologies and groups in the region starting from the Balfour Declaration, passing through the infamous Sykes-Picot agreement and ending in the invasions of Iraq and Libya before making their way into Syria. The latest group to gain the full support of the US on the ground in Syria is the Syrian Kurdish YPG forces (People's Protection Units).
The US threw its lot in with the Kurds in Iraq at first as it supposedly tried to find partners who reportedly pose a credible threat to ISIS. Thus, their pick of the Peshmerga Kurdish group came as a result of mutual interest in the region. The Kurds wanted to establish their own autonomous state in the region and the US wanted to reenter Iraq under the pretext of helping the Kurds fight ISIS.