Which south american patriot of irish descent became the leader of newly independent chile?
a. simón bolívar
b. francisco de miranda
c. bernardo o’higgins
d. josé de san martín

It was "A. Barnardo O'Higgins" who was the South American patriot of Irish descent who became the leader of newly independent Chile, although it should be noted that his leadership was initially disputed. 

Abolition of slavery