That is a garbled and incorrect reference to the origin of the word Navajo. In the Tewa language nava was an old word for cultivated field and hu meant the mouth of a canyon - so navahu was cultivated fields in the mouths of canyons. It does not mean "enemy of cultivated fields".
Predjuduce has probably been around for almost all of humanity's existance. I would guess that it started with the formation of the first tribes/wars, with one tribe hating anyone in an enemy tribe just because they were in that tribe.
You would more or less have to relocate to a mountainous area, to a lot that got its water from as close to the headwaters of a water source as possible. Any cultivated fields upstream of you would degrade your water.
By befriending an enemy the enmity in the enemy is destroyed.
That would be me. I am the greatest enemy of love. >:D
A racoon's main enemy would be a wolf.
Various reasons, disagreements with other members or chiefs would be one of the main reasons a nation splits. Sometimes a nation would split so that they may go out in search of better food sources or living conditions. Sometimes also would be that enemy tribes would attack a tribe so the tribe would end up breaking off to escape fighting while other members would refuse to leave the area.
That would be the Pygmee tribe in South Africa.
Would I tell you if I were? Would I shoot you first?
Actually paddy is a monsoon crop, so it is mostly cultivated in monsoon regions of China, India and Bangladesh.
A few would be: Productive, Full, Cultivated, and growing/fertile.
An enemy is someone who is against you or someone you strongly dislike. Some antonyms of enemy would be ally, friend, partner, and comrade.
The Pitjantjatjara Tribe