Who had spheres of influences in China?

In China in the late 19th and early 20th century, Britain, France, Germany, Russia, and Japan had special powers over large swaths of territory based on securing "nonalienation commitments" for their "spheres of interest;" only the United States was unable to participate due to the Spanish–American War.

increased food supply

improved public health

increased birth rates

hope this : d

answer; the period of time known as the middle ages;