Which continent would have been hurt by the following innovations(maxim gun, quinine, steamboat, telegraph lines) during the
19th century?"

Europe.

Explanation:

Europe is the continent would have been hurt by  innovations such as maxim gun, quinine, steamboat, telegraph lines during 19th century. These innovations were manufactured by the European countries due to advancement of technology. These innovations causes a lot of pollution, death and damaged the geography of the the continents. Maxi gun was used in the war which is responsible for more death whereas steamboat releases smoke due to burning of coal causes pollution.

people can eat food during that time

a, both were musicians during the jazz age