Which European country entered World War I as a part of the central powers but later switch sides to the allies in 1915

Why was russia drawn into a conflict with germany after ausria-hungary declared war on serbia ?

Which answer best describes an advantage of shipping goods by canal? most towns would rather have canals than noisy railroads. goods could travel very fast downstream in the canal system. travelling by boat is a much more relaxing way to transport goods. heavy loads of goods could travel by boat more easily than if pulled by horses.

Who was francis marion and how was he linked to the revolutionary war?