Without black, no color has any depth. But if you mix black with everything, suddenly there's shadow - no, not just shadow, but fullness. You've got to be willing to mix black into your palette if you want to create something that's real. ↗
Every citizen or subject of another country, while domiciled here, is within the allegiance and the protection, and consequently subject to the jurisdiction, of the United States. ↗
But, if you observe children learning in their first few years of life, you can see that they can and do learn on their own - we leave them alone to crawl, walk, talk, and gain control over their bodies. It happens without much help from parents. ↗