Germany was delayed in getting to France and, because of a defense treaty, Britain entered the war.
Germany entered neutral Belgium on August 4, 1914, Britain then gave an ultimatum to Germany to leave the country. That was refused, and the UK declared war later that same day.
Germany invaded Belgium that was neutral
world war one was not fought to end anything in particular. it began when a Serbian nationalist shot Archduke Ferdinand of Austria. this caused Austria-Hungary to declare war on Serbia. Russia, which was allied with Serbia, entered the war, and Germany, allied with Austria-Hungary, also entered. France, which was allied with Russia, declared war on Germany. Italy, allied with Germany, entered the war, and Germany marched through Belgium in order to invade France. Britain, allied with Belgium, declared war on Germany and it's allies, and so forth until the participants extended the world over. the US entered the war because of Germany's use of unrestricted U-boat, or submarine, warfare against neutral nation's merchant fleets.
world war one was not fought to end anything in particular. it began when a Serbian nationalist shot Archduke Ferdinand of Austria. this caused Austria-Hungary to declare war on Serbia. Russia, which was allied with Serbia, entered the war, and Germany, allied with Austria-Hungary, also entered. France, which was allied with Russia, declared war on Germany. Italy, allied with Germany, entered the war, and Germany marched through Belgium in order to invade France. Britain, allied with Belgium, declared war on Germany and it's allies, and so forth until the participants extended the world over. the US entered the war because of Germany's use of unrestricted U-boat, or submarine, warfare against neutral nation's merchant fleets.
Great Britain declared war on Germany.
Britain had a treaty to protect the neutrality of Belgium.
France entered the First World War on the 3rd of August, they saw this as an opportunity for Revenge against Germany for the events that took place in Alsace Lorraine. Britain entered the First World War on the 4th of August, in support of it's Ally, and promise to aid and protect Belgium's Neutral standing in the War.
France and Britain never went to war against each other. The United States entered the war because of Germany's unrestricted submarine warfare and the their telegraph to Mexico telling to attack.
britain and the neutral countries
Belgium
This just refers to the fact that at the time of the Battle of Britain, all other European countries had been overrun by Nazi Germany. The USA was still neutral so Britain was standing alone against a formidable enemy.