Question

HELP AND FAST! Medal AND Fan!!!


what was the significance of the following

1.Students killed at Tienanmen square
2.DNA first used to convict criminals
3.Chernobyl nuclear accident
4. Reagan presidency -major themes of his presidency
5. Reagan tax cut And impact
6. Strategic Defense initiative program(star wars)
7.Iran Contra affair
8.George H.W Bushes presidency



If you can just answer as many as yo can thanks!!!!