While that resolved Iran's major grievances, it failed to respond to the issue of freedom of navigation in the Shatt al-Arab. The issue rumbled on in the following decades, with Iraq adopting a more assertive foreign policy in the 1970s following the rise of Saddam Hussein. In 1969 Iran abrogated the 1937 treaty, resulting in the 1974–75 Shatt al-Arab clashes with Iraq on the Shatt al-Arab. In retaliation Iraq supported Arab separatists in Iran’s oil-rich Khuzestan province, with Iran supporting Kurdish rebels in Iraq. A peace agreement was signed on 6 March 1975 in Algiers in which both parties pledged to further demarcate the border, both on land and in the Shatt al-Arab, based upon the Ezurum Treaty and Constantinople Protocol. A further treaty was signed in Baghdad that year, confirming the Algiers provisions, along with maps marking the border.