Initially, each representative mandated for around 30,000 people. Nowadays, because of the increase in population, each representative mandated for around a million people. With an increase or a decrease in population it might change in the future.
The Preparedness Movement was a campaign led by former Chief of Staff of the U.S. Army Leonard Wood and former President Theodore Roosevelt to strengthen the U.S. military after the outbreak of World War I.
Light bulbs were the power source used in factories during the industrialization
From what I know ethnocentrism means someone who thinks their culture is higher than another therefore I would go with A.
