One of the effects of the 9/11 attack is that all of the funds that fueled IRA terrorism in the UK dried up.
The descendants of Irish immigrants in Boston and New York were a large source of the IRA's donations. All of a sudden blowing up British children wasn't a noble and romantic thing any more. Raining body parts is apparently only fun if it isn't happening to you.
Gerry Adams (leader of the IRA's political wing) saw which way the wind was blowing and shut it down.
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