the USD is a highly profitable instrument. The USD is used a lot in daily commerce, so it has high liquidity, and all economic news has an impact on the USD exchange rate with other currencies, so the USD exchange rate has many fluctuations. in a day and is the preferred tool of profit for short term investors
It is a strong currency especially because of its wide usage and the area it covers in trade, exchange, diplomatic dialogues are measured in US currency. When organizations want to give support to a country, it is always in dollar value that the debate goes. This is an advantage for the usa dollar.