From Kabul to Baghdad: How many countries has US bombed since 2001 and at what cost? Since 2001, the United States has fought three major wars and carried out air and drone strikes in at least 10 countries, reshaping global geopolitics in the name of the “war on terror”. These conflicts have caused an estimated 940,000 direct deaths and are projected to cost the US around $8 trillion, including long-term veterans’ care.