Territory flows and trade flows between 1870 and 2008

Countries gain and lose territories over time, generating territory flows that represent the transfer of territorial sovereignty. Countries also export and import goods, creating trade flows that represent the transfer of merchandise ownership. We find a substitution between these two international flows during the years 1870 and 2008; that is, country pairs with greater trade flows have smaller territory flows. This indicates how international trade enhances international security: reciprocal goods transactions discourage irreciprocal territorial exchanges.