One of the sources of pressure against the use of capital punishment in the United States is foreign governments. Half the world's states do not use capital punishment. Importantly, that half includes all of Western Europe. The states of Western Europe, as a result of their economic situation and their economic cohesiveness, are better positioned than most other states in the world to put pressure on the United States on human rights matters.
"Execution Of Foreign Nationals In The United States: Pressure From Foreign Governments Against The Death Penalty,"
ILSA Journal of International & Comparative Law: Vol. 4
, Article 25.
Available at: http://nsuworks.nova.edu/ilsajournal/vol4/iss2/25