Preorder Navajo Wars by GMT Games
You would indeed start the next turn at 2 prestige.
As per the rule book:
5.2.5 Expenditures & Diplomacy. At the end of each turn, drop
Funding by one (shift the “Jihadist Funding” marker one box
leftward on the Funding Track). Drop Prestige by one (shift the
“Prestige” marker leftward) if any country is under Islamist Rule.
Then, if Net World Posture is “3” and the same as US Posture, add
+1 Prestige (rightward).
NOTE: Remember that a marker on a track may never fall below
the lowest value on the track or exceed the highest value on the
track. For example, if US Prestige is at “1” and is subject to a –1,
it would remain “1”. Prestige of “1” subject to –1 and then +1 for
Diplomacy would result in Prestige of “2”.