Relations were usually peaceful between the Spanish and the French because they reconized a common boundary. Explain the need for a commonly reconized boundary cultures in confict today.
You may get some ideas in some of these sites.
http://www.google.com/search?source=ig&hl=en&rlz=1G1GGLQ_ENUS342&q=fences+make+good+neighbors&aq=f&oq=&aqi=