Every country the US has invaded since 2001 has cost the US blood and treasure, left the invaded country far worse off, and created refugees and terrorist blowback. However, war with Iran would undoubtedly take the cake. From David Stockman at antiwar.com:
By the twisted logic of Imperial Washington you could say the Iranians were asking for it. After all, they had the nerve to locate their country right in the middle of 35 U.S. military bases!
Then again, your saner angels may ask: What in the hell is Washington doing with a massive military footprint in a region and in a string of backwater countries that have virtually no bearing on homeland security, safety and liberty?
Djibouti? Oman? Kyrgyzstan? Uzbekistan? Afghanistan? Bahrain? Kuwait? And, yes, Iraq and Iran?
In fact, Washington destroyed the former for no good reason and based on egregious Big Lies about Saddam’s nonexistent WMDs and sheltering of al-Qaeda. That turned Iraq into a failed state hellhole pulsating with sectarian frictions and anti-American grievances – even as the rump state of Iraq centered in Baghdad fell under the control of Iran-friendly Shiite politicians and militias.