Nonsense. The Kurds have lived in that region for ages (approx. since the 12th century).
Yes. But now they want to turn Syrian territory into their own nation. They also occupy parts of Iraq. But they are citizens of that country, not a separate nation. In Turkey, terrorist Kurds have been battling Turks. America, and Europe, have listed the Kurdish YPG arm a terrorist organization. So we'd be supporting terrorists against Turkey our NATO ally.
Frankly, I think they should have a nation. But it isn't up to America to decide and force our will on others. You'd be the first person to complain, "There goes America again. Throwing its weight around." You'd be right. The Kurds are going to have to work this out with Syria and Turkey just like they worked out an arrangement with Iraq.
Additionally, Kurds have used the Syrian civil war to expand their territory. That's in the last two years or so, not since the 12th century. The civil war has created a huge refugee problem. Millions of Syrians who lived along the Turkish border have fled into Turkey for protection, areas now occupied by Kurds. What happens to the Syrians if the Kurds keep the territory for themselves,which is their plan? Frankly, it's a mess. All these quarrelling tribes. Let's see how the Russians make out. Putin's a smart guy. We'll see just how smart he is.