How did the rise of nationalism lead to the decline of Muslim States?

The decline of the, (Mostly Muslim), Ottoman Empire, primarily caused by

a conservative and powerfull clergy (which cause it to fall from a pre-eminant

position in central Europe in the 1700's to the 'sick man of Europe' by the '1900's),

caused it to become a bone of contention among potential collinizers,

(and the political and economic justification for them to start WW I).

They refused to modernize, couldn't compete in a changing environment,

and became a target for power/territory grabs.