which is the safest way to carry money on a trip to the United States?
- I need to pay taxes (to travel country)? where and when I pay ?
- I can use this money in neighboring countries (eg: canada) ?
- I need to have some document ?
Carrying cash is a bad idea. You might be victim of asset forfeiture or run into money laundering laws. In theory, you can carry cash as long as it is properly declared.