After President Trump withdrew the U.S. from the Paris climate accords, the reaction from liberals has been nothing short of unhinged.

It was a liberal Harvard professor, though, who took the prize for single dumbest tweet. And the reaction from Harvard alum Sen. Ted Cruz, R-Texas, has us cheering.

Joyce E. Chaplin, the chair of American Studies and history professor at Harvard University, tweeted that the U.S. was created by the international community through the 1783 Treaty of Paris.

The USA, created by int'l community in Treaty of Paris in 1783, betrays int'l community by withdrawing from #parisclimateagreement today

— Joyce E. Chaplin (@JoyceChaplin1) June 1, 2017

That prompted Sen. Cruz to completely roast this supposed academic’s historical ignorance.

Just sad. Tenured chair at Harvard, doesn't seem to know how USA was created. Not a treaty. Declaration+Revolutionary War+Constitution=USA. https://t.co/tQALvjdkTs

— Ted Cruz (@tedcruz) June 2, 2017

Lefty academics @ my alma mater think USA was "created by int'l community." No--USA created by force, the blood of patriots & We the People. https://t.co/zOxVdj21en

— Ted Cruz (@tedcruz) June 2, 2017

It’s sad that Cruz needs to remind a Harvard history professor that the treaty ending the Revolutionary War was not an agreement by the “international community.” But, honestly, did anyone expect any different from the radical leftists running our nation’s “top” universities?