The Middle East is a more dangerous place after eight years of the Obama Presidency than it was before. The eight disastrous Obama years follow eight disastrous Bush years during which that part of the world became more dangerous as well. So have many other international hot spots. In sum, the past 16 years have seen major foreign policy blunders all over the world, and most especially in the area between Libya and Iran, that includes Israel, Egypt, Syria, Iraq, Lebanon, Turkey and the Gulf.

With regard to the conflict between Israel and the Palestinians, the Obama policies have made the prospects for a compromise peace more difficult to achieve. When Israel felt that America had its back – under both President Clinton and Bush 43 – they offered generous proposals to end settlements and occupation in nearly all of the West Bank. Tragically the Palestinian leadership – first under Arafat and then under Abbas – did not accept either the Barak-Clinton offers in 2000-2001, nor the Olmert offer in 2008. Now they are ignoring Netanyahu’s open offer to negotiate with no pre-conditions.

In his brilliant book chronicling the American-Israeli relationship – “Doomed To Succeed” – Dennis Ross proves conclusively that whenever the Israeli government has confidence in America’s backing, it has been more willing to make generous compromise offers, than when it has reason to doubt American support. President Obama did not understand this crucial reality. Instead of having Israel’s back, he repeatedly stabbed Israel in the back, beginning with his one–sided Cairo speech near the beginning of his tenure, continuing through his failure to enforce the red-line on chemical weapon use by Syria, then allowing a sunset provision to be included in the Iran deal, and culminating in his refusal to veto the one-sided Security Council resolution, which placed the lion’s share of blame on the Israelis for the current stalemate.

These ill-advised actions – especially the Security Council resolution – have disincentivized the Palestinian leadership from accepting the Netanyahu offer to sit down and negotiate a compromise peace. They have been falsely led to believe that they can achieve statehood through the United Nations, or by other means that do not require compromise.

Related coverage The Holocaust Meets American Ignorance, Antisemitism, and ‘Alternative Facts’ As the memory of the Holocaust fades -- and after the world recently commemorated the 75th anniversary of the end...

The Iran Deal, while it delayed Iran’s acquisition of nuclear weapons, virtually guaranteed that it would be allowed to develop a nuclear arsenal as soon as the major restrictions on the deal expire in the next decade. Israel will never allow a regime sworn to the destruction of the Nation-State of the Jewish People to secure such a genocidal weapon. So the likelihood of an eventual dangerous military confrontation has been increased rather than decreased by the poorly negotiated Iran deal.

Obama’s failure to carry out his red-line threat against the Syrian regime’s use of chemical weapons has weakened American credibility among its allies and adversaries alike. It has created a vacuum of power that Russia was quick to fill. Turkey, too, has flexed its bullying muscles, as its irascible and egomaniacal leader has used the excuse of ISIS to go after another American ally, the Kurds, who have at least as strong a claim to statehood as do the Palestinians.

America’s traditional allies in the mid-East – Israel, Egypt, Saudi Arabia, the Emirates and Jordan – have all been weakened by the Obama policies, most especially by the Iran deal. America’s traditional enemies – Iran, Syria and Hezbollah – have been strengthened, along with Turkey.

Terrorism has increased and moved northward to Europe, partly as a result of the Syrian crisis.

ISIS, Al Qaeda, the Taliban – and other terrorist offshoots – thought weakened, remain a serious threat to regional stability and to civilians.

A destabilized Middle East poses increasing dangers to American allies and to peace. The blame for this instability is shared by presidents Bush and Obama. The overthrow of Saddam Hussein and the invasion of Iraq divided that country into ungovernability and invited Iran to play a major role in its current destabilized condition. The toppling of Gaddafi left Libya open to increasing terrorist influences. The attempt to replace Assad has turned Syria into a nightmare. The forced resignation of Mubarak initially placed Egypt under the control of the Muslim Brotherhood and strengthened Hamas in the Gaza Strip. Only a coup, opposed by the Obama Administration, restored some semblance of stability to Egypt. Lebanon has become a wholly owned subsidiary of Hezbollah, a terrorist group under the influence of Iran that has 100,000 missiles aimed at Israel’s population centers. The Shia arc now runs from Iran through parts of Iraq and Syria and into Lebanon.

This is the tragic legacy of the Obama administration’s failed efforts to undo the harms caused by the Bush administration. Radical Islamic terrorists have replaced authoritarian secular tyrants. Both are bad, but tyrants at least produce a degree of stability and predictability. They also tend to keep their tyranny domestic, whereas terrorists tend to export their evil tactics. We should have learned the lesson from the replacement of the tyrannical Shah of Iran by the far more tyrannical and dangerous Ayatollahs. But we did not. We insisted on supporting the “democracy” of the Arab spring, which resulted in the replacement of undemocratic domestic tyrants by undemocratic international terrorists.

History will look kindly on Obama’s domestic successes, but it will judge his Mideast policy harshly.

Alan M. Dershowitz, Felix Frankfurter Professor of Law, Emeritus at Harvard Law School and author of Taking the Stand: My Life in the Law and Electile Dysfunction: A Guide for the Unaroused Voter.