music: 80's Chart Toppers: Name The Artist: Even It Up?

Questions

In 1833 Ada ---------- (future first computer programmer) meets Charles Babbage.?

In 1849 ---------- becomes a constitutional monarchy.?

In 1875 Pacific ---------- formally opens.?

In 1883 John Maynard ---------- (in Cambridge, England), another economist, born.?

In 1900 Dennis---------- , inventor of holography (3D laser photography), born.?