On this day: April 22

POSTED: 11:48 AM PDT Apr 19, 2013    UPDATED: 11:00 PM PDT Apr 21, 2015 
Deepwater Horizon oil drilling rig fire

Thousands rush to claim land in Oklahoma, the first nationwide Earth Day takes place, Richard Nixon dies, federal agents seize Elián González, and the Deepwater Horizon drilling rig sinks while spewing oil, all on this day.