Before WW1 Britain's economy was dependent on income from colonies and trading with other countries.
Britain's involvement in WW1 was mainly because of Britain's interest. One of the biggest causes was rival empires.
The Battle of the SommeBritain composed a plan to bombard the German trenches with the biggest artillery barrage anyone has ever seen. The plan failed miserably and Britain had gained slight knowledge of the Germans.
Britain's SocietyBritain's society changed in the way that they think and how the citizens support the war effort. The Women's Suffrage Act was also passed at this time.
A negative impact on Britain was that the economy was at its lowest point. Unemployment reached its highest at 11.3% in 1921 and the country was in debt.
A positive outcome of the war was that Britain knew that it could no longer depend on trade and income of colonies. This meant that Britain made more factories and became more independent.