Misc: what italian landmark has 296 steps?

Questions

In 1896 US Marines landed in ---------- to protect US citizens.?

In 1899 Martha ---------- of Brooklyn, became first woman to die by electrocution.?

In 1925 John---------- , Former Nixon White House aide, born.?

In 1939 Brian---------- , Prime Minister of Canada, born.?

In 1942 Gen ---------- vowed, "I shall return."?