Misc: The sea gods had a three-pronged spear called a(n) ?

Questions

60s: This bridge, the largest suspension bridge in the US, was finished in 1964.?

60s: He was the first president born in the 20th century.?

60s: Martin Luther King, Jr. was assassinated in this city.?

60s: This remote area was crossed on foot for the first time in 1968-1969.?

60s: John Young and him were the first astronauts to fly the two-occupant Gemini.?