To help France and Russia defeat Germany. Britain wanted Germany to lose WWI, so they joined France and Russia. Britain was worried that if Germany won WWI, they would be too powerful for England to defeat by themselves, so they joined France and Russia and declared war on Germany.
WWII started after Germany attacked Poland and Russia declared war on Germany. Germany declared war on Russia and France and Britain declared war on Germany. Then Italy jumped in as Germany's ally. The United States didn't enter the war until Japan attacked Pearl Harbor in 1944.
England and France declared war on Germany after Germany, (and Russia), invaded Poland.
England and France declared war on Germany after Germany, (and Russia), invaded Poland.
After the assassination of Archduke Ferdinand Austria-Hungary declared war on Serbia. Russia declared war on Austia-Hungary so Germany declared war on Russia, France then declared war on Germany and after the invasion of Belgium by Germany, England also declared war on the Germans. Also on the side of the axis were Bulgaria and the Ottoman Empire.
Germany had an agreement to go to war if Austria-Hungary were to be attacked by Russia. Alliances like this were a main cause that brought many countries into WW1.
Germany was allied with Austria-Hungary in 1914. Serbia was allied with Russia, and Russia was a member of the Triple Entente with France and Britain. When Austria declared war on Serbia after the assassination of Archduke Franz Ferdinand in Sarajevo. Russia declared war on Austria. Germany then declared war on Russia and subsequently on France and Britain.
After archduke Ferdinand was assassinated, Austria Hungary declared war on Serbia. Russia then came to Serbia's aid because of an alliance and declared war on Austria Hungary. Germany declared war on Russia because of its alliance with Austria Hungary. Britain declared war on Germany because of its alliance with Russia. Other countries such as France and the Ottoman Empire soon chose sides and World War 1 began
The countries that started World War I were Serbia, Austria-Hungary, Germany, and Russia. Those were the base and then more countries joined.
Germany declared war with Russia on 1st of August 1914 & in WW2 on the 22nd June 1941.
France; Great Britain; the Ottoman Empire; Germany -Blissful
World War I began on July 28, 1914, when Austria-Hungary declared war on Serbia. Russia mobilized in defense of Serbia on July 30, 1914, and Germany declared war on Russia on August 1. Following this, Germany declared war on France on August 3 and invaded Belgium on August 4, prompting Britain to declare war on Germany the same day. Italy joined the war later, switching sides to the Allies in 1915, while the United States entered the conflict in April 1917.