It's called an Embargo.
James Madison
That is usually called a blockade or an embargo
When a government bans trade with other countries it can be called embargo or boycotting, depending on the circumstances. Embargo is when a government bans trade with another country in attempt to isolate it. Boycotting is when trade is ban in order to intimidate or show disapproval and need for change.
The legal ban on trade is referred to as a trade restriction or sanction (which also has other meanings).
The US lifted their ban on foreign trade with Vietnam on February 3, 1994. President Clinton is the person how lifted the ban.
They helped ban the opium trade.
embargo
An embargo
President Thomas Jefferson imposed a ban on all trade in 1807. It was known as the Embargo of 1807.
No they´re not. The UK trade has called for a total Ban. eBay and Amazon have banned it completely. But somehow Nintendo likes it.
The Athenian trade ban on Megara.