The modern state of greece gained its independence after a ten-year war against

The modern state of Greece gained its independence after a ten-year war against the Ottoman Empire.

Explanation:

The 'Greek war of independence' was fought for about 10 long years from 1821 to 1832. Greece was under the control of the Ottoman Empire from the middle of the '15th century AD'. A secret organization called 'Filiki Eteria' was founded by the pioneer Greek revolutionaries in the year 1814 to plan full-proof revolts against the Ottomans. It took them 6 years to begin the revolt and start the war.

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