In the 1400s, who had the worlds largest empire?

Can someone me out with this , i'm putting 30 points on it

To encourage railroad companies to build railroads across the west, the government gave them subsidies by select the best answer from the choices provided. a. paying the wages of laborers b. giving them building materials c. providing railroad trains d. providing free land

What is an australian ballot? a secret ballot provided at public expense an imported ballot printed in australia a ballot made by an individual voter a ballot used in electronic data systems