Why is the US withdrawing its troops from Iraq?

- Iraq: 23 events in the last 90 days
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What happened
A US-led coalition deployed in Iraq more than a decade ago to fight jihadists concluded its mission on Wednesday, a move celebrated by the country's leaders, but which some fear will embolden pro-Iran armed factions. France 24's Angela Diffley takes a look at the security challenges facing the country and why the US has chosen this moment to take its troops out.
Summary assembled by rule from the sources below