Through 1990 census data, I took a look at the rank of French among the languages spoken in the home. In every state, English is the number one language spoken, so I started looking at foreign languages and ranking them among which had the greatest percentage in each state. Though there were a few languages that were not represented in some of the states I did not find any states that did not speak French. Out of the 26 language categories polled, French was always ranked among the top seven languages in a state. For each state, there was a table like this:
This map shows the cumulative data from all 50 states and the District of Colombia concerning the French language and how it ranked among the other 26 languages in the census data.
Whenever French was third or fourth, the first language was always Spanish and the second would be German. In the states where French ranked below fourth, there was a large number that spoke German, except for in Hawaii and California, where there are large Tagalog speaking populations and other oriental languages.
For the most part, French has had an everlasting influence on American culture, as have other languages. You can still see major Spanish influences in street names and the cities of the West coast as well as French influences in the Midwest and British influence along the East coast. Our country has always been a very diverse and culturally rich nation, and for as far as I can tell, it will continue to be.