The strength of a currency generally depends on its exchange rate with other currencies, but simply being worth more than one U.S. dollar per unit doesn’t automatically make it the "strongest." Strong currency is typically a mix of high valuation per unit and economic stability.

Beriem tvoj argument, ale myslel som skor strenght tym, ze sa skoro vsetko na svete porovnava s USD.

The U.S. dollar is the world's strongest currency due to its status as the primary global reserve currency, widespread use in international trade, and the economic stability and liquidity it provides.