Spanish and Italian
These two languages are so similar that words are identical. As you can see in this video. Now I hope Americans realize that being bi-lingual or tri-lingual has it's advantages. I'm a bit of a polyglot with about 4 or 5 languages/dialects under my belt.
Again I mention Spanish and Italian because in the Philippines, tagalog is 30% Spanish and then there's Chabacano which is Spanish Creole. And my grandfather is mostly Spaniard who speaks Castilian Spanish and of course we have Italian ancestry.