Event:
WLS-AM in Chicago, Illinois begins radio transmissions
More Notable Events on April 11:
1992 Euro-Disney opens near Paris
1970 Apollo 13 launched to Moon; unable to land, returns in 6 days
1968 President Johnson signs 1968 Civil Rights Act
1900 U.S. Navy's 1st submarine made its debut
1899 Treaty of Paris ratifies ends war; Spain cedes Puerto Rico to US
