The US has provided global leadership in tackling important issues such as terrorism.  America’s hegemonic power has enabled it to provide global leadership on important international concerns. Because the US is affected by the same problems as many other countries in an increasingly inter-connected world (for example climate change, terrorism, epidemics, oil crises, economic recessions, the illegal drugs trade, and nuclear proliferation) it is in its interests to promote policies that are broadly globally beneficial. The US is able to utilize its considerable economic and diplomatic clout to convince its allies to back important multilateral international initiatives. One example of this was George W. Bush’s initiative on HIV/AIDS in the developing world. The United States has also used its power to unify the global effort against terrorism and provide collective security and considerable aid to various nations, as well as leading the international effort to prevent failed or weak states (such as Somalia and Yemen) falling into the hands of terrorists.