(ancient china)
to this day many chinese doctors use to help their patients

acupunctureTo this day many Chinese doctors continue to use to help their patients

acupuncture is the answer

Explanation:

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on april 6, 1917, the u.s. joined its allies--britain, france, and russia--to fight in world war i. under the command of major general john j. pershing, more than 2 million u.s. soldiers fought on battlefields in france.