What made wwi the first “modern” war?

Which of the following was probably the most difficult challenge facing construction of the railroad?

Who introduced arabic numerals to italy, which make bookkeeping possible? a. brunelleschi b. cosimo de medici c. fibonacci d. gregory xi e. giovanni de bicci de medici

What was a goal of the treaty of versailles? question 4 options: to germany rebuild its industry to build better roads and factories in germany to make sure germany did not invade france in the future to give great britain and the united states credit for their in wwi