What process allows for people who do not have parents who are US citizens or
were not born on US grounds to become
citizens?

A foreign citizen or national can become a U.S. citizen through a process called naturalization. The privilege of citizenship requires allegiance to the United States.

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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).