The world would be a different place because so much happened as a knock on of that but at the same time it's hard to imagine what the world would be like. Probably very similar but also different in substantial ways.
Like obvious things like no war in Iraq or Afghanistan (at least not those wars), and less obvious things like how the attacks have reshaped liberal democracies like the US and Europe (for the worse imo), and how they empowered right wing politics in many countries (also bad imo).
The TSA is just a federal jobs program. They don't actually provide any value; it's been demonstrated that they miss the vast majority of contraband. The most notable function of the TSA is the temporary imposition of an authoritarian-esque environment of suspicion and control on innocent civilians, reminding us to follow the rules, or else.
Next time you want to prevent 9/11, you probably have to prevent all the reasons they had to hate us.
From ChatGPT-4:
The history of Western involvement in the Middle East before the September 11, 2001 attacks is extensive and complex, involving a range of diplomatic, economic, military, and political actions. Some key instances include:
Sykes-Picot Agreement (1916): A secret agreement between Britain and France, with assent from Russia and Italy, to divide the Ottoman Empire's territories in the Middle East after World War I.
Balfour Declaration (1917): The British government expressed support for a "national home for the Jewish people" in Palestine, which was then part of the Ottoman Empire.
Creation of Modern Middle Eastern States: After World War I, Western powers, particularly Britain and France, were instrumental in redrawing the borders in the Middle East, leading to the creation of many modern states.
Iranian Coup d'état (1953): The CIA, with British support, orchestrated a coup to overthrow Iranian Prime Minister Mohammad Mosaddegh and strengthen the monarchical rule of Shah Mohammad Reza Pahlavi.
Suez Crisis (1956): France, the UK, and Israel invaded Egypt in response to Egyptian President Gamal Abdel Nasser's nationalization of the Suez Canal.
Support for Various Regimes: Western countries, especially the United States, supported various regimes in the Middle East, some of which were authoritarian, for strategic and economic interests, particularly during the Cold War.
Lebanese Civil War (1975-1990): The U.S. and other Western countries were involved in various capacities during the Lebanese Civil War.
Soviet-Afghan War (1979-1989): The U.S. and its allies supported Afghan mujahideen in their fight against the Soviet occupation.
First Gulf War (1990-1991): A U.S.-led coalition expelled Iraqi forces from Kuwait. This war also led to the stationing of U.S. troops in Saudi Arabia, which was one of the grievances cited by Osama bin Laden.
Sanctions against Iraq: Following the Gulf War, the United Nations, with strong U.S. and UK backing, imposed sanctions on Iraq that had significant humanitarian impacts.
Israeli-Palestinian Conflict: The U.S. and other Western countries have been deeply involved in this conflict, often perceived as being biased towards Israel.
Various Military Bases and Operations: The U.S. and its allies have maintained a military presence in various parts of the Middle East for strategic reasons.
This list is not exhaustive and simplifies a complex history. Each of these events has a nuanced background, and their impacts are still felt in the region's contemporary politics.