Oligopoly is a market structure in which a small number of firms has the large majority of market share. An oligopoly is similar to a monopoly, except that rather than one firm, two or more firms dominate the market.
It is dictionary definition.
In 1866 Austria gave Venetia to France, and France gave it to Italy, so Venetia was again united with the rest of Italy. So, in 1866 Italian unification was advanced by annexing Venetia, an important and rich region.
By this time Lombardy, which long formed a unity with Venetia, was already united with Italy.
C. New ideas in human rights and democratic governments led to rebellions