Which happened earlier: Thames Tunnel opens or Yosemite National Park established?

Question 1

Which happened earlier?

A Thames Tunnel opens ✓ Earlier

B Yosemite National Park established

Thames Tunnel opens (25 March 1843) came before Yosemite National Park established (1 October 1890)

Question 2

Which happened earlier?

A 1984 published

B Voice of America first broadcast ✓ Earlier

Voice of America first broadcast (24 February 1942) came before 1984 published (8 June 1949)

Question 3

Which happened earlier?

A Mariner 2 reaches Venus ✓ Earlier

B Glen Canyon Dam completed

Mariner 2 reaches Venus (14 December 1962) came before Glen Canyon Dam completed (13 September 1964)

Earlier #197