The Geopolitics of Currency: Why the dollar still rules

The Geopolitics of Currency: Why the dollar still rules
US President Donald Trump has declared BRICS "Dead". This comes just months after repeatedly threatening 100% tariffs on its members over "de-dollarization" efforts. But why is Trump so concerned about BRICS? Why does the US see any move away from the dollar as a direct threat? And where does India stand in this evolving economic battle?