What sport has been contested annually in Britain since 1715 in the race called "Doggett's Coat and Badge"?

Question

What 1850 agreement between the USA and Britain resulted eventually in the British Mosquito (or Miskito) Coast protectorate becoming part of Nicaragua?

Answer 1

Rowing
It is the oldest rowing race in the world. Thomas Doggett, joint manager of Drury Lane Theatre, was rescued by a Thames "Waterman" after falling overboard and in gratitude, offered a wager to young Watermen in their first year of freedom, of a traditional red Watermens' coat with a silver badge "representing Liberty", to commemorate the 1 August 1714 accession of George I of the House of Hanover.