Why did european powers support greece’s independence movement against the ottoman empire’s control?

Independence was finally granted by the Treaty of Constantinople in July 1832 when Greece (Hellas) was recognized as a free country. The Greeks were the first of the subject peoples of the Ottoman Empire to secure recognition as a sovereign power. Greeks celebrate their independence day annually on March 25.

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from the conditions of the working class in england by friedrich engels,the main idea is :

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.