Why would Spain want to keep “New Spain and not let it become an independent nation

Fear of French domination strengthened the desire of many in the New World to seek autonomy. Father Miguel Hidalgo and Ignacio Allende led a rebellion in New Spain that erupted on September 16, 1810. Tens of thousands followed them, but they did not make social or economic demands.

Explanation:

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the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).