What changes in the welfare system did Johnson work (unsuccessfully) for?

According to the video, two of the ways government can play a role in the economy is by protecting property rights and to

What did passage of the immigration act of 1965 accomplish? the law lowered the number of asians allowed to immigrate to the us. the law allowed no more immigration from european nations. the law supported victims of political persecution. the law made an effort to establish a quota system.

The decision states that legislation cannot overcome social prejudice. can it reinforce social prejudice? how?