What clause are included in our constitution to make our nation secular?

This principle of overlap, rather than separation of religion and state in India was further recognized in a series of constitutional amendments starting with Article 290 in 1956, to the addition of word 'secular' to the Preamble of Indian Constitution in 1975.

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.