What were two causes for the Battle of Britain?

Battle of Britain is the name commonly given to the effort by the Luftwaffe to gain air superiority over the Royal Air Force (RAF), before a planned sea and airborne invasion of Britain during the Second World War. The Luftwaffe tried to destroy the Royal Air Force.

Explanation:

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.

it provided for equal trade rights among nations in china.