After you reach modern age and have armys and tanks, you should take however many armies you need on to a choke point were there are mountains(this is easiest wen you start in n. america and have rivals only in s. america...making the choke point in lowst mexico)right at the end of the narrow land point, there are mountains.Just put armies of modern armor(filled armies)on those mntns and no one will attack you from land!!!!!!!!!!!!!!! this is how i am conquering the world!!!!!!!!!
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