Denmark advises transgender people to contact US Embassy before traveling to the United States

No country has a significantly larger population than any other. The difference is only how out they are and thus how easy it is to find out they are LGBTQ+. Countries that allow trans people to use their actual gender on their travel documents, for example, are more likely to be detained or deported as the US no longer recognizes actual gender as a valid identifying trait for travel document purposes. It must list a marker for genitals at birth or genitals chosen by the parent at birth for intersex people. And those with X or similar non-binary markers may not be accepted at all since that's not a recognized valid marker in the US anymore. And it's difficult to prove that your genitals at birth were what they are now and the same as your gender marker on your passport. Genitals at birth is not an identifying trait for an adult, but that's what the US expects. Gender is barely an identifying trait, but is slightly more relevant in some cases at least than how you looked as a baby. So if the marker doesn't match their expectation, then they could consider that as being deceptive based on your appearance or behavior and thus reason to deny entry or detain or deport. And being detained in a for profit US immigration prison could result in abuse and death. Especially for trans people put in the wrong gender section of a prison.