most likely because they were able to predict the future and knew hitler would kil them all anyway
They had alliances with countries that were involved.
Japan had early alliances with Germany. They were promised the Pacific Island holdings of the US if the Axis powers won the war.
Germany's aggressive actions in the early 20th century, particularly its invasion of Belgium in August 1914, prompted Britain to enter World War I. Britain had a longstanding commitment to protect Belgian neutrality, established by the Treaty of London in 1839. When Germany violated this neutrality as part of its war strategy, Britain declared war on Germany on August 4, 1914, in defense of Belgium and to uphold its commitments. Additionally, the broader context of rising tensions and alliances in Europe played a significant role in Britain's decision to join the conflict.
Germany invaded Belgium that was neutral
No
Britain joined the Triple Entente in 1907, solidifying its alliances with France and Russia. This agreement was partly a response to the growing threat posed by the Central Powers, particularly Germany. The Triple Entente aimed to counterbalance the military strength of the Triple Alliance, which included Germany, Austria-Hungary, and Italy.
Britain declared war on Germany on August 4, 1914 after Germany invaded Belgium.
There were no other alliances apart from the Triple Entente - Britain, France & Russia and the Triple Alliance - Germany, Austria-Hungary & Italy. They are were the only alliances involved not true Britain had an Alliance with Belgium and Russia had an Alliance with Serbia
Britain declared war on Germany on 3rd September 1939, two days after Germany invaded Poland.
Britain, Russia and France. Germany, Italy and Austria-Hungary.
In order to protect itself against other country's with their help. It works both ways in an alliance.
Britain was concerned about France's defeat by Germany at the end of the 19th century because it altered the balance of power in Europe, making Germany a dominant military force. This shift threatened British interests and security, as a powerful Germany could challenge British naval supremacy and colonial ambitions. Additionally, Britain feared that a united Germany could disrupt established alliances and lead to increased tensions, prompting a reevaluation of its own foreign policy and alliances.