These days, the only people who seem to be opposing the the US archipelago of wars around the world are the isolationist right, as shown by this essay in American Conservative.
Unfortunately, the (very) few mainstream anti-War voices on the left are largely silent these days, because of the fear of being seen as supporting Trump, but we do have meaningful movement supporting a reduction of America's imperial ambitions on the right:
The mainstream media has attacked President Donald Trump’s decision to withdraw U.S. troops from Syria as impulsive, blindsiding his own national security team. But detailed, published accounts of the policy process over the course of the year tell a very different story. They show that senior national security officials and self-interested institutions have been playing a complicated political game for months aimed at keeping Trump from wavering on our indefinite presence on the ground in Syria.The article is worth a read, as well as some serious consideration for the upcoming year.
The entire episode thus represents a new variant of a familiar pattern dating back to Vietnam in which national security advisors put pressure on reluctant presidents to go along with existing or proposed military deployments in a war zone. The difference here is that Trump, by publicly choosing a different policy, has blown up their transparent schemes and offered the country a new course, one that does not involve a permanent war state.