White House Biography
From the official White House site

The American President: Lyndon B. Johnson
Another finely detailed biography

Lyndon B. Johnson
Wikipedia bio of the president

Lyndon B. Johnson
Biography from the Internet Public Library

The Kennedy Assassination
Still a controversy

The Election of 1964
Johnson wins in a landslide.

The Cold War
Decades-long struggle with Communist powers

The Civil Rights Movement
LBJ helped tremendously in this regard

Civil Rights Act of 1964
Entire text of the famous, wide-reaching law

The Great Society
Johnson's domestic policies

The War on Poverty
LBJ's attempt to level the economic playing field

The Vietnam War
Johnson escalated things precipitously