Which constitutional right provided the legal basis for Gideon’s appeal?

The Sixth Amendment's

Gideon appealed his conviction to the US Supreme Court on the grounds that the Fourteenth Amendment incorporated the Sixth Amendment's right to counsel to the states. The Supreme Court ruled in Gideon's favor, requiring states to provide a lawyer to any defendant who could not afford one.

Explanation:

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the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.