germany invaded belgium in order to march into france
They did enter the war.
Great Britain declared war on Germany in September 1939 after Germany invaded Poland.
The US and Great Britain fought a war in the early 19th century known as the War of 1812.
Belgium
1812
The end of war between France and Great Britain
They and Great Britain had committed to the defense of Poland.
Great Britain entered World War 2 in 1939 after Germany invaded Poland.
yes, Britain entered the war at the beginning, the united Staes entered the war over two years later.
Japan wasn't in WW1.
On March 28, 1854, Great Britain formally entered the Crimean War when it declared war on Russia. The war had been going on since October 4, 1853, when the Ottoman Empire declared war on Russia.