England became a unified state during the 10th century and takes its name from the Angles, one of a number of Germanic tribes who settled in the territory during the 5th and 6th centuries. The capital of England is London, which is the largest urban area in Great Britain. In 1707, it became a constituent country of the United Kingdom of Great Britain and Northern Ireland.
The name "England" is often used as a colloquialism for the entirety of the UK, even today. In the works of Eric Flint, characters before the Act of Union of 1707 who use the name "England" are referring to the Kingdom of England. Characters after 1707 usually mean the UK.
In 1633, England joined the League of Ostend after King Charles I read the history books regarding his death and the English Civil War. The Royal Navy entered into conflict against the Netherlands after betraying their Dutch allies by destroying what remained of the Dutch navy. Charles also kept the Grantville delegation to London imprisoned in the Tower.
Throughout the League's war against the United States of Europe, England remained somewhat aloof from the overall conflict, a decision which was not very popular with the English people. Richard Boyle, the Earl of Cork, was able to build on this frustration by arranging for King Charles to have an accident which badly injured Charles and killed Queen Henrietta Maria. Charles blamed his first minister Thomas Wentworth, whom he ousted, and elevated Boyle in his stead.
With Charles I in bad health, the future King Charles II may become king sooner than in OTL (Which is bad for the father and his supporters as the son was more complacent to the demands of Parliament and the English people)
The heir may also reverse relations with the USE Alliance (Which could allow England to annex/unionize with Scotland and Ireland with the support of the USE)
A plot is underway to replace the dying English King with Louis of the Palatinate despite the latter being a Catholic as resentment for the king is at an all time high