The 1992 Earth Summit in Rio de Janeiro produced Agenda 21, the Rio Declaration, the Forest Principles declaration and major climate and biodiversity treaties.

Since the mid-twentieth century, there have been efforts to limit the spread of nuclear weapons, but existing arsenals remain.

International treaties create legal obligations among states, but these can be modified, suspended, or terminated.

A treaty normally moves through negotiation, adoption, authentication, consent to be bound, publication and entry into force.

International treaties must meet certain criteria to be valid; otherwise, they will be considered defective.

Treaties are agreements aimed at producing international legal effects. They have many synonyms and different types.

The United States and Canada are major immigration destinations, but the latter actively seeks immigrants more than the former.

Regional crises have led Latin Americans to move to other countries in the region or to Northern America, particularly the United States.

Even though the continent receives many migrants from other regions, Europeans are more likely to remain in European countries.