This would be called a trade embargo: the prohibition on a trade with the country that the embargo was imposed on.
A recent high-profile embargo is the embargo on Russian products by many European countries, which was imposed in response to the invasion of Crimea
Answer:
This made double-cropping possible in some areas, and in some places, even triple-cropping became possible ... the hardiness and productivity of various varieties of rice were and are in large part responsible for the density of population in South, Southeast, and East Asia.
Public education and military protection. Local governments across the nation fund schools to educate citizens while the federal government funds the military, which helps to secure our nation.
While the government produces relatively few goods in America, it produces many more services. Regulations that protect the environment and the rights of citizens are some other examples of key services the government provides.