In the Spanish language case, I think the differences between Spanish native speakers and American native speakers are not so much. From both sides of the Atlantic ocean we are perfectly able to understand each other even not knowing the meaning of some words and idioms. Above all these differences we have our common language heritage, treasured in the Spanish literature from authors of both sides, that have crated a great intercultural net that allow us to have a good comprehensión of the two greatest varieties of our language.