Which 1840s calamity cut Ireland's population by about a quarter through death and emigration?

Under the 1814 Treaty of Kiel, after the Napoleonic Wars, which country ceded Norway to Sweden? After the 1967 Six-Day War, which Middle Eastern canal remained closed until 1975? The U.S. gained control of Guam, Puerto Rico and the Philippines as a result of which 1898 war? As a result of which 1980 FBI sting operation did Michael Myers become the first House member expelled in over 100 year… As a result of which December 16, 1773, incident did Britain close the port of Boston? As a result of which scandal did H. Lawrence Garrett III step down as Navy secretary in 1992? As a result of which war was Swaziland under British control from 1903 to 1968? As a rookie in 1975, which Chicago Bear led the NFL in kickoff returns before a "sweet" career as a running back?