Lyndon B. Johnson has been one of the presidents of the United States with a more difficult role. He was the one who had to happen to Kennedy after the assassination of this one, a complicated moment for the USA.
In addition, when he entered the White House had a very controversial project on the table, such as the Civil Rights Act of 1964, a law to protect especially the blacks, who suffered atrociously discriminatory at that time.
The law was very complex. On the one hand, the president had Martin Luther King Jr, who pressed him to approve the law as it was found, without changing anything at all.
On the other hand, the president had the Democrats of the south of the country, which is where the coexistence between blacks and whites is more complicated, because it was those states that defended slavery. If the law passes as it is it is possible that the democrats of those states leave the party.