The United States began building the coalition on September 12, 2001, and there are currently 70 nations supporting the global war on terrorism. To date, 21 nations have deployed more than 16,000 troops to the U.S. Central Command’s region of responsibility. This coalition of the willing is working hard every day to defeat terrorism, wherever it may exist.
--from the International Contributions to the War on Terror page at www.centcom.mil
The administration has been struggling to enlist other countries to contribute troops to the Iraqi occupation force and reduce the strain on the U.S. military. Despite vigorous appeals from the president and his senior advisers, however, foreign governments have been reluctant to provide large numbers of troops. While the administration has queried 70 countries about the possibility of contributing forces, 10 have thus far agreed to contribute about 20,000 troops by the end of the summer. Only Britain, Ukraine and Poland have provided substantial assistance so far.
--Washington Post, July 3, 2203
Of course, those countries agreed to join in the war on terror. They didn't agree to join whatever-the-hell war we said was part of the war on terror....