C. John Locke. That should be correct
Pursing a dangerous policy to the limits of of saftey before stopping. Cuban Missile Crisis
Discrimination it's a hard topic because it has been around for many years and even today, taking into account how many things have happened the lately years, there exists discrimination. Though that is because people have a problem judging others before getting to know them and make up their own assumptions about them. People do not ever try to put themselves in their shoes.
I believe the 3rd one! If not I am very sorry.....
The idea of manifest destiny greatly helped shape the U.S. governments's policies of land acquisition, since this held that the US was "destined" to expand from the Atlantic Ocean to the Pacific--meaning that the US embarked on a series of wars with Mexico and confrontations with Natives that helped the settlers move west.