Published in 2018, so the numbers are higher now.
"The United States has spent nearly $6 trillion on wars that directly contributed to the deaths of around 500,000 people since the 9/11 attacks of 2001.
...
Overall, researchers estimated that "between 480,000 and 507,000 people have been killed in the United States' post-9/11 wars in Iraq, Afghanistan, and Pakistan."
This toll "does not include the more than 500,000 deaths from the war in Syria, raging since 2011" when a West-backed rebel and jihadi uprising challenged the government, an ally of Russia and Iran. That same year, the U.S.-led NATO Western military alliance intervened in Libya and helped insurgents overthrow longtime leader Muammar el-Qaddafi, leaving the nation in an ongoing state of civil war."
https://www.newsweek.com/us-spent-six-trillion-wars-killed-half-million-1215588
"The United States has spent nearly $6 trillion on wars that directly contributed to the deaths of around 500,000 people since the 9/11 attacks of 2001.
...
Overall, researchers estimated that "between 480,000 and 507,000 people have been killed in the United States' post-9/11 wars in Iraq, Afghanistan, and Pakistan."
This toll "does not include the more than 500,000 deaths from the war in Syria, raging since 2011" when a West-backed rebel and jihadi uprising challenged the government, an ally of Russia and Iran. That same year, the U.S.-led NATO Western military alliance intervened in Libya and helped insurgents overthrow longtime leader Muammar el-Qaddafi, leaving the nation in an ongoing state of civil war."
https://www.newsweek.com/us-spent-six-trillion-wars-killed-half-million-1215588