US war on terrorism has played havoc with the safety, security and stability of Afghanistan and Pakistan. Security situation in Afghanistan and Pakistan is worse than ever before. This book addresses the issue of Terrorism, how it evolved over the past and how it is affecting the security of Afghanistan and Pakistan. Furthermore rise, fall and then resurgence of Taliban in Afghanistan and Pakistan have been covered in detail. Aftermath of 9/11, US war in Afghanistan and Pakistan''s role has been discussed in depth. This book focuses on the Implications of war on terrorism on Pakistan and Afghanistan and suggests some recommendations for long term viable peace in this volatile region. This book can be useful for the policy makers around the world, who seeks long term peace and stability in Afghanistan and Pakistan because peace and stability of Afghanistan and Pakistan is paramount for the peace and stability of the whole world. The writer has endeavored to cover every aspect of US War in Afghanistan and its impact at regional and global level.