Most republics have a president of some kind, most of them as head of state - even at least one constitutional monarchy has a president (Spain).
The United States: President of the Republic (head of state)
France: President de la Republique [President of the Republic] (head of state)
Italy: Presidente della Republicca [President of the Republic] (head of state)
Italy: Presidente del Consiglio dei Ministri [President of the Council of Ministers] (head of government)
Spain: Presidente del Gobierno [President of the Government] (head of government)
Germany: Bundespräsident [Federal President] (head of state)
Most governments in Africa have a President as head of state, presumably some also have a President as head of government. Even China, whose head of state is actually translated as State Chairman, uses the term President as the official translation to conform to western standards.
More than four, if you think about all the American presidents, British prime ministers, French presidents and Russian presidents. Leaders of other countries also would like to think of themselves as being involved.
Presidents generally considered to have been strong and effective leaders typically viewed the presidency as a stewardship. This sentiment was made popular by Theodore Roosevelt.
what Theodore Roosevelt called a "stewardship"
Leaders are elected in democratic governments. Though some are more democratic than others.
no, they did not.
Northwest Ordinance of 1787
Northwest Ordinance of 1787
34, counting presidents only 39, counting presidents and acting presidents 53, counting presidents, acting presidents, and chairmen of government Juntas (including two co-chairmen that governed jointly) More information: http://en.wikipedia.org/wiki/President_of_bolivia
They could have less crappy leaders
The Republic of Germany changes government leaders very peacefully . . . probably more peacefully than the US does.
This question is like "When did you stop beating your wife".
the members of the single house are elected by the people