The fall of the Berlin Wall.
Nixon and Wallace took advantage of the rising discontent among the conservatives and positioned themselves as defenders of property rights. The increasing level of violent protests had served to aggravate equal feelings against the civil right movements especially among conservative supporters.
The Framers wanted it to be relatively easy to consider changes to the Constitution. Yet they wanted proposed changes to be carefully considered.They also wanted to be sure that Amendments had the full support of the nation.Therefore, it is more difficult to ratify an Amendment and make it into law than it is to propose, or suggest, it.
Because it's the way of the road.