After Elvis Presley's death in 1977, which "Okie from Muskogee" singer had a hit with "From Graceland to the Promised Land"?

After the fall of communism in 1989, Poland joined NATO in 1999 and which group of nations on May 1, 2004? After "The Flying Nun" was grounded in 1970, which actress starred in the sitcom "The Girl with Something Extra"? After the invasion of Poland, Great Britain and which other nation declared war on Germany on September 3, 1939? After the Khmer Rouge took power in 1975, which capital was forcibly emptied of nearly all its residents? After the League of Nations dissolved in 1946, its Geneva headquarters went to which organization? After the Long Parliament was purged in 1648, the remaining "Rump Parliament" brought charges against which king? After the May 30, 1996 telecast, who left "Entertainment Tonight" to pursue his music career? After the French monarchy fell in 1792, which statesman fled to England and then to the United States?