Argentina's longest international border, running for thousands of miles along the Andes, is shared with which country?

In which 1980 movie starring Dan Aykroyd and John Belushi did Aretha Franklin play the owner of a soul food cafe? Argentina claimed which islands in 1820, before Britain took them over in 1833 without firing a shot? Argentina mourned which former actress and first lady when she died of cancer in 1952? Argentina declared its independence from which country in 1816? Argentina's new 1949 constitution allowed which sitting president to run for re-election? The mineral argentite is an important ore of which metal? Aarhus, Denmark's second-largest city, lies on which part of the country? Ariana Richards and Joseph Mazzello played the young grandchildren in which 1993 dinosaur blockbuster?