The Government of Canada warns:
The rate of firearm possession in the US is high and in many states citizens openly carry firearms in public. Incidences of mass shootings occur, resulting most often in casualties. Although tourists are rarely involved, there is a risk of being in the wrong place at the wrong time. Familiarize yourself on how to respond to an active shooter situation. There is a threat of terrorism which could occur at any time. Targets could include: government buildings, including schools, places of worship, airports, and other transportation hubs and networks, tourist attractions, restaurants, bars, coffee shops, shopping centers, markets, and hotels. Always be aware of your surroundings when in public places. Passports with an "X" gender identifier does guarantee your entry or transit through the US or other countries. You may still be asked to provide your sex/gender information as either male or female when travelling.
