There are a few reasons why this requirement is in place. First, it helps to maintain the integrity of the country's immigration system by ensuring that visitors are entering for legitimate purposes and not as a means to rely on public benefits. Second, it helps to safeguard the economic interests of the country by ensuring that visitors are financially able to contribute to the local economy through their expenses while they are in the United States. Lastly, it ensures that visitors have a positive experience during their stay by having the means to enjoy their time in the country without financial hardships.

It's worth noting that this requirement is not meant to discriminate against any particular group of visitors. It applies to all visitors entering the United States, regardless of their nationality or background. The purpose is simply to ensure that everyone can meet their own financial needs during their stay and to maintain the country's resources and stability.

In conclusion, the U.S. government's requirement for visitors to have the means to support themselves during their stay is an important measure to protect both the country and the visitors themselves. By ensuring that visitors have enough funds to cover their expenses, the government can maintain the integrity of its immigration system, safeguard its economic interests, and provide a positive experience for visitors.