Map of events during World War One. This map uses modern borders. Many of the borders were quite different during World War One.
Map of Europe in 1914.
In this map the The Central Powers (shades of green and yellow) consist of Austria-Hungary, Germany, Bulgaria and the Ottoman Empire. The allied powers (various shades of red) are Serbia, Russia, France, the United Kingdom, Italy, Belgium and the United States. The neutral countries are shown in grey.