1918: The start of WWl.

After the assassination of Archduke Franz Ferdinand, Austria-Hungary declared war on Serbia, and Russia declared war on Austria-Hungary, and the German Empire declared war on Russia, which caused the start of WWl.

Choose your nation, build your economy, stabilise your country, declare war on other countries, etc.

Choose your nation. As long as it existed during WWl, it is available. Questions are allowed.