Which Middle Eastern leader believed that his people should dress like westerners, adopt the Latin alphabet, attend state-run schools, and use the Gregorian calendar

His name was Mustafa Kemal Atatürk.

Explanation:

did some research

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.