What are facts about the US and Mexico relations?

You should note that when international politics and diplomacy are involved, there are no real friends but different countries with common or diverging interests that more often than not, end up in 'friendly rivalries', contempt or even outright war.

That being said, Mexico and the United States are neither allies nor enemies. Both countries aren't allies, as neither have signed any mutual-defense treaties such as NATO. Both aren't enemies either, as there haven't been any military confrontations between both countries for the last 93 years.

The US and Mexico are close business partners, and at least on paper, respect each other's interests.