What did the court decide in Ashcroft v. Iqbal?
Answered for: US
To survive a motion to dismiss, a complaint must contain sufficient factual matter, accepted as true, to “state a claim to relief that is plausible on its face.”
The Court extended Twombly's plausibility standard to all federal civil cases. The sentence above is the court in its own words.
This answer is true in US and nowhere else on this site. Another jurisdiction is another answer, or an honest gap: see what has been read for US.