✔ 最佳答案
按照美國法律,如果您攜帶超過一萬美金現金入境,一定要向美國海關申報,否則海關可以沒收您的財產。
There is no limit on how much you can carry, but you may not want to carry a lot of cash around. In US, credit cards are accepted everywhere so there is no need to have a lot of cash.
In the shops, if you pull out a stack of $100 bills, it will certainly attract unwanted attention, since most people only carry 5 $20 in their wallets.