What term refers to anything that interferes or limits a country's ability to trade with another country?

What are the most populous and least areas of russia and why are some areas more heavily populated than others

Why is mary salter ainsworth a central figure in psychology?

Why are governments formed? what role does government play in society? what would life be like without government? what purpose of government would have the most dramatic effect on society if it were taken away? which purpose of government has the greatest effect on your daily life?