Setting the scene
The Iran nuclear deal (JCPOA) was signed July 14, 2015, between Iran and six world powers. Iran agreed to limit uranium enrichment and allow inspections in exchange for sanctions relief. The deal was negotiated over 20 months in Vienna.
What happened
President Obama championed the deal; President Trump withdrew the U.S. in 2018, leading Iran to resume enrichment. The deal demonstrated diplomacy could constrain nuclear proliferation but also its fragility to political change.
Why it still matters
July 14, 2015, marked a rare diplomatic breakthrough in the Middle East.
Background
Trump later withdrew the US.