The true statement about Iraq from the provided options is:
U.S. forces toppled the government of Saddam Hussein during the Second Persian Gulf War.
This refers to the 2003 invasion of Iraq, which is often considered the Second Persian Gulf War, resulting in the fall of Saddam Hussein's regime. The other statements are not accurate. Iraq did not annex Kuwait after the Second Persian Gulf War; instead, it was expelled from Kuwait during the First Persian Gulf War in 1991. Additionally, no weapons of mass destruction were found in Iraq after the 2003 invasion, and the reconstruction of Iraq's economy faced significant challenges and criticisms.