Event:
Amid unrest in the Mideast, activists claim China has launched the largest crackdown on dissenters in recent years
More Notable Events on March 31:
1992 U.N. Security Council voted to ban flights and arms sales to Libya
1968 Lyndon Baines Johnson announces he will not seek re-election
1963 Los Angeles ends streetcar service after 90 years
1921 Albert Einstein lectures in New York on his new theory of relativity
1889 300m Eiffel Tower officially opens, commemorates French Revolution
