What was the main use of submarines in WWI

According to nationalists, a nation-states government should be a. controlled by european monarchs b. led by an appointment president c. voted on by european parliaments d. chosen by that nation-state

Adirect democracy is similar to a representative democracy because both forms of government a. have leaders with unlimited powers. b. are led by a single ruler. c. allow citizens to vote in elections. d. do not protect the rights of the citizens.

What is the term for a short statement about history that has not been yet been proved