macrohistory & world timeline  Timeline: 1771 to 1780  1771  By
the Gamtoos River, clashes occur between Xhosa people and Dutch
trekkers (pastoral wagon pullers).  1772  Oxygen is discovered
by the Swedish chemist Carl Wilhelm Scheele. Europeans have been
investigating the properties of gasses.  1773  A Baptist Church
for black slaves is founded is South Carolina Colony.  1773  Tea
selling businessmen in Boston are upset because the British East
India Company has been given the right to sell tea directly to
the colonists and at a cheaper price. The business men have
begun a boycott of the East India Company's tea along the
Atlantic coast. They disguise themselves as Indians and throw
342 chests of tea into Boston harbor – to be known as the Boston
Tea Party.  1774  An English chemist, Joseph Priestly,
independently discovers oxygen.  1774  King George III of
Britain decides to punish lawbreakers in the colonies. He closes
Boston Harbor and expands the powers of his governor in
Massachusetts. Local elections i