Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In the aftermath of the 2003 invasion of Iraq and the subsequent sectarian violence a number of terrorist attacks have targeted the Sadr City district of Baghdad. The 2003 invasion of Iraq (from March 20 to May 1, 2003) was led by the United States, alongside the United Kingdom and smaller contingents from Australia and Poland. Four countries participated with troops during the initial invasion phase, which lasted from March 20 to May 1. These were the United States (248,000), United Kingdom (45,000), Australia (2,000), and Poland (194).