Since 1981, Friedman has traveled widely covering Middle Eastern Affairs (including the 1982 Israeli invasion of Lebanon, the First Palestinian Intifada, and the ongoing Israeli-Palestinian Conflict) and has specialized in U.S. domestic politics and foreign policy, international economics, and the worldwide impact of the terrorist threat. By immersing himself in the Islamic culture, Friedman attempts to locate and articulate the source of the Muslims' intense anger towards Americans.