International assistance
Intervention should be avoided at all costs. The US should help weak and failed states gain legitimacy through foreign aid and other forms of assistance. This choice requires the US to increase its foreign aid and assistance programs. In truly dire situations, the US would support UN-led peacekeeping interventions but would still condemn outright unilateral military intervention.
As President George W. Bush, you have made a series of choices dealing with America's counter-terrorism policies. Let's analyze your choices and their implications.
Your decision to fight two large conventional wars in the Middle East was problematic. The US will suffer thousands upon thousands of casualties and rack up trillions in debt. The Afghanistan mission will only be half successful. The US will drive out the Taliban, but the Afghani government will not be able to sufficiently secure their sovereignty. The Iraqi mission will also only be half successful. Saddam Hussein will be disposed of, but Iraq will slip into long-term instability and serve as a safe haven for future terrorists (ISIS).
That being said, you will minimize al-Qaeda's capabilities as a terrorist organization (even if other groups may thrive later on as a result of the blowback effect of US interventionism). Additionally, Iraq will not be able to provide terrorist organizations with WMDs. Other potential state distributors of WMDs will view the American threat of intervention as credible.
Next, you decided to increase American foreign assistance to future weak and failed states. Foreign aid is generally ineffective. The recipient government must be able and willing to efficiently allocate these resources. Corrupt officials, authoritarianism, lack of distribution networks, and strong non-state groups all threaten the effectiveness of the aid. Minimizing interventionism in the long run may reduce the probability of blowback radicalization and terrorism, but you should expect terrorism to continue to thrive as safe havens will likely continue to exist.
The issues of terrorism and weak/failed states do not have easy solutions, but you have done a fair job. You have sufficiently dealt with the threat of terrorism. Furthermore, you have assuaged the American public and will get re-elected in 2004. However, the wars will be catastrophic, costly, and lengthy.