Forbidden:

Forbidden: Plants, fresh fruit, vegetables and meats from overseas are not allowed into the U.S. Nor are products made from endangered animal or plant species.

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U.S. Customs:

Visitors who have been abroad at least 48 hours, and have not made a claim for exemption in the past 30 days, can return home with $400 per person in purchases without paying any duty. One liter of alcohol, and 200 cigarettes or 100 cigars (per resident 21 years or older) are allowed in duty-free.

The next $1,000 worth above the base sum is subject to a straight 10-percent levy. After that, the levies vary according to the article. Articles at least 100 years old and original works of art may be exempt.

Keep a complete record of your purchases (with receipts attached) and have it accessible.

For complete details, obtain a copy of Know Before You Go from U.S. Customs.

Gifts From Abroad:

A gift mailed from abroad, if less than $100 in value, is exempt from duty if the same person does not receive more than $100 in gift shipments in a single day. However, there is no limit on the number of persons to whom gifts may be sent in a day, or on the number of days in which additional gifts can be sent to the same person.