UnScramble this Word: i e s c e r h t?

Questions

In 1972 Great Britain imposed direct rule over?

In 1976 Argentine pres. Isabel ---------- was deposed by her country's military.?

In 1986 US and ---------- clash in the Gulf of Sidra.?

In 1989 Oil tanker ---------- runs aground in Alaska's Prince William Sound -- causes world's worst oil spill.?

In 1821 ---------- gains it's independence.?