What was the role of electric power in
the booming economy of the 1920s?

As more consumers got electricity they purchased electric appliances, which helped support the boom.

Explanation:

thats the correct answer for E2020

monarchy doesn’t have to have the hereditary element. there have been elective monarchies in the past where you choose your king-for-life and when he dies elect someone else for the job.

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories