Very few companies demonstrate the complexity of the current trade conflict and the strategic necessity of securing rare earth materials for the U.S. more effectively than MP Materials (MP 0.43%), and its share price action this week, up 21.8% at the time of writing, underscores this point.A complicated trading positionManagement describes the company as being "America's rare earth magnetics champion," as it is "America's only fully integrated rare earth producer." However, as fellow Fool.com writer Rich Sm ...