I've read in various places that the opposite is actually true -- sanctions from the liberal US strengthens the liberals in Iran by highlighting how the regime's aggressive policy is resulting in economic pain for Iranians.
This didn't really work with China either. Granted, there are plenty of examples where sanctions have failed/backfired but I'd like to reject any "general" statement on the best way to liberalize a country through foreign policy.
This is part of a historical pattern that’s basically unbroken but is aptly represented by the US involvement in the world wars. What business did the premier power in North America, or the Western Hemisphere, have in a European war between empires? What possible benefit would accrue to them from it? Very similar argument for the European theatre in WWII but the Pacific theatre is, if anything, more ridiculous if you don’t start the history of US involvement with Pearl Harbour. The US embargoes the Empire of Japan, banning most importantly the export of oil. They know the Empire of Japan cannot continue its never ending clusterfuck of an attempt to conquer China without oil. This was a calculated attempt to bring the Japanese to heel they had to have known could lead to war. And this was not isolated. The only reason the US military started hostilities against the Empire of Japan after Pearl Harbour rather than before was logistical fuckups.
https://en.wikipedia.org/wiki/Flying_Tigers
The US is, in every part of it, hostile to anything that isn’t a democratic republic. This is true even if wide heads within USG know that democracy is bad for US interests. If the Arab Spring had actually succeeded anywhere apart from Tunisia it would have been a car crash for the US. The Arab public is a lot less willing to deal with Israel than the dictatorships, monarchies and juntas that currently surround it, and democracies are very likely to lead to civil war and ethnic cleansing in any country with no tradition of liberal government. See Syria. The US tries to arm the non-existent liberal opposition and all the weapons end up with the people who were Al Qaeda in Syria until yesterday or with those shouting “The Christians to Lebanon. The Alawites to Hell!”
The reality is: US foreign policy does not care one tiny bit about the liberal/ilieberal or democracy/dictatorship spectrums, it only cares(rightly, some may argue) about its own(mostly economic) self-interests. As pertains to the MENA region, that mostly means it only cares about the economics and politics of the oil business(though there is in an irrational, lobby-driven, tendency to protect Israel in any and all things even when it harms the aformentioned oil intersts). The liberal/illiberal thing is a red herring and mostly about gaining the support of their citizens for whatever thing they want to undertake right now.
Do note, I'm not in any way condemning the US for the way they tend to act around the world, they're just looking out for themselves. I'm just saying, it has nothing to do with favoring particular modes of government and to argue otherwise is to cherry-pick maybe 30% of the events the last 60 years and ignore the rest which does not line up with your particular worldview.
They have done the same or similar in a lot of South America, starting well before the world wars.
That is not to say that they are unique in this - it is how all empires operate. My point is only that the US is not some idealistic, freedom, democracy, and everything good loving benefactor of the world. It is an empire, one that is quite good to its own people but that ruthlessly pursuits its rational interests abroad.
This makes sense only if you define "liberal" as "aligned with the interests of Washington and/or American corporations". For god's sake, USA supported Saddam Hussein while he was gassing Kurdish civilians during the Iran-Iraq war.
https://en.wikipedia.org/wiki/United_States_support_for_Iraq...
> Joost R. Hiltermann says that when the Iraqi military turned its chemical weapons on the Kurds during the war, killing approximately 5,000 people in the town of Halabja and injuring thousands more, the Reagan administration actually sought to obscure Iraqi leadership culpability by suggesting, inaccurately, that the Iranians may have carried out the attack.