WASHINGTON (Reuters) -Americans will be allowed to choose an X for gender on their passport applications beginning on April 11, the U.S. State Department said on Thursday as the Biden administration marked a “Transgender Day of Visibility” amid moves by some states to target transgender people. The State Department in June said U.S. citizens could select their gender on applications without having to submit medical documentation. In October, it issued the first American passport with an “X” gender marker, designed to give nonbinary, intersex and gender-nonconforming people a marker other than …